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<link rel="stylesheet" href="../coverage.css"/> <title> mw_engine/natural_rules.clj </title>
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001&nbsp;&nbsp;(ns&nbsp;^{:doc&nbsp;&quot;A&nbsp;set&nbsp;of&nbsp;MicroWorld&nbsp;rules&nbsp;describing&nbsp;a&nbsp;simplified&nbsp;natural&nbsp;ecosystem.
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002&nbsp;&nbsp;
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003&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Since&nbsp;the&nbsp;completion&nbsp;of&nbsp;the&nbsp;rule&nbsp;language&nbsp;this&nbsp;is&nbsp;more&nbsp;or&nbsp;less&nbsp;obsolete&nbsp;-
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004&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;there&nbsp;are&nbsp;still&nbsp;a&nbsp;few&nbsp;things&nbsp;that&nbsp;you&nbsp;can&nbsp;do&nbsp;with&nbsp;rules&nbsp;written&nbsp;in&nbsp;Clojure
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005&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;that&nbsp;you&nbsp;can&#x27;t&nbsp;do&nbsp;in&nbsp;the&nbsp;rule&nbsp;language,&nbsp;but&nbsp;not&nbsp;many&nbsp;and&nbsp;I&nbsp;doubt&nbsp;they&#x27;re
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006&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;important.&nbsp;&quot;
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007&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:author&nbsp;&quot;&nbsp;Simon&nbsp;Brooke&nbsp;&quot;}
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008&nbsp;&nbsp;&nbsp;&nbsp;mw-engine.natural-rules
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009&nbsp;&nbsp;&nbsp;&nbsp;(:require&nbsp;[mw-engine.utils&nbsp;:refer&nbsp;[get-int&nbsp;get-neighbours&nbsp;get-neighbours-with-state&nbsp;member?]]))
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010&nbsp;&nbsp;
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011&nbsp;&nbsp;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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012&nbsp;&nbsp;;;;;
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013&nbsp;&nbsp;;;;;&nbsp;mw-engine:&nbsp;the&nbsp;state&#x2F;transition&nbsp;engine&nbsp;of&nbsp;MicroWorld.
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014&nbsp;&nbsp;;;;;
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015&nbsp;&nbsp;;;;;&nbsp;This&nbsp;program&nbsp;is&nbsp;free&nbsp;software;&nbsp;you&nbsp;can&nbsp;redistribute&nbsp;it&nbsp;and&#x2F;or
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016&nbsp;&nbsp;;;;;&nbsp;modify&nbsp;it&nbsp;under&nbsp;the&nbsp;terms&nbsp;of&nbsp;the&nbsp;GNU&nbsp;General&nbsp;Public&nbsp;License
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017&nbsp;&nbsp;;;;;&nbsp;as&nbsp;published&nbsp;by&nbsp;the&nbsp;Free&nbsp;Software&nbsp;Foundation;&nbsp;either&nbsp;version&nbsp;2
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018&nbsp;&nbsp;;;;;&nbsp;of&nbsp;the&nbsp;License,&nbsp;or&nbsp;(at&nbsp;your&nbsp;option)&nbsp;any&nbsp;later&nbsp;version.
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019&nbsp;&nbsp;;;;;
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020&nbsp;&nbsp;;;;;&nbsp;This&nbsp;program&nbsp;is&nbsp;distributed&nbsp;in&nbsp;the&nbsp;hope&nbsp;that&nbsp;it&nbsp;will&nbsp;be&nbsp;useful,
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021&nbsp;&nbsp;;;;;&nbsp;but&nbsp;WITHOUT&nbsp;ANY&nbsp;WARRANTY;&nbsp;without&nbsp;even&nbsp;the&nbsp;implied&nbsp;warranty&nbsp;of
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022&nbsp;&nbsp;;;;;&nbsp;MERCHANTABILITY&nbsp;or&nbsp;FITNESS&nbsp;FOR&nbsp;A&nbsp;PARTICULAR&nbsp;PURPOSE.&nbsp;&nbsp;See&nbsp;the
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023&nbsp;&nbsp;;;;;&nbsp;GNU&nbsp;General&nbsp;Public&nbsp;License&nbsp;for&nbsp;more&nbsp;details.
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024&nbsp;&nbsp;;;;;
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025&nbsp;&nbsp;;;;;&nbsp;You&nbsp;should&nbsp;have&nbsp;received&nbsp;a&nbsp;copy&nbsp;of&nbsp;the&nbsp;GNU&nbsp;General&nbsp;Public&nbsp;License
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026&nbsp;&nbsp;;;;;&nbsp;along&nbsp;with&nbsp;this&nbsp;program;&nbsp;if&nbsp;not,&nbsp;write&nbsp;to&nbsp;the&nbsp;Free&nbsp;Software
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027&nbsp;&nbsp;;;;;&nbsp;Foundation,&nbsp;Inc.,&nbsp;51&nbsp;Franklin&nbsp;Street,&nbsp;Fifth&nbsp;Floor,&nbsp;Boston,&nbsp;MA&nbsp;&nbsp;02110-1301,
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028&nbsp;&nbsp;;;;;&nbsp;USA.
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029&nbsp;&nbsp;;;;;
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030&nbsp;&nbsp;;;;;&nbsp;Copyright&nbsp;(C)&nbsp;2014&nbsp;Simon&nbsp;Brooke
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031&nbsp;&nbsp;;;;;
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032&nbsp;&nbsp;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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033&nbsp;&nbsp;
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034&nbsp;&nbsp;;;&nbsp;treeline&nbsp;at&nbsp;arbitrary&nbsp;altitude.
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035&nbsp;&nbsp;(def&nbsp;treeline&nbsp;150)
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036&nbsp;&nbsp;
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037&nbsp;&nbsp;;;&nbsp;waterline&nbsp;also&nbsp;at&nbsp;arbitrary&nbsp;altitude.
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<span class="covered" title="2 out of 2 forms covered">
038&nbsp;&nbsp;(def&nbsp;waterline&nbsp;10)
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039&nbsp;&nbsp;
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040&nbsp;&nbsp;;;&nbsp;and&nbsp;finally&nbsp;snowline&nbsp;is&nbsp;also&nbsp;arbitrary.
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041&nbsp;&nbsp;(def&nbsp;snowline&nbsp;200)
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042&nbsp;&nbsp;
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043&nbsp;&nbsp;;;&nbsp;Rare&nbsp;chance&nbsp;of&nbsp;lightning&nbsp;strikes
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044&nbsp;&nbsp;(def&nbsp;lightning-probability&nbsp;500)
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045&nbsp;&nbsp;
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046&nbsp;&nbsp;;;&nbsp;rules&nbsp;describing&nbsp;vegetation
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047&nbsp;&nbsp;(def&nbsp;vegetation-rules
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048&nbsp;&nbsp;&nbsp;&nbsp;(list
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049&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;Randomly,&nbsp;birds&nbsp;plant&nbsp;tree&nbsp;seeds&nbsp;into&nbsp;grassland.
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050&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn&nbsp;[cell&nbsp;_]&nbsp;(cond&nbsp;(and&nbsp;(=&nbsp;(:state&nbsp;cell)&nbsp;:grassland)(&lt;&nbsp;(rand&nbsp;10)&nbsp;1))(merge&nbsp;cell&nbsp;{:state&nbsp;:heath})))
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051&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;heath&nbsp;below&nbsp;the&nbsp;treeline&nbsp;grows&nbsp;gradually&nbsp;into&nbsp;forest,&nbsp;providing&nbsp;browsing&nbsp;pressure&nbsp;is&nbsp;not&nbsp;to&nbsp;high
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052&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn&nbsp;[cell&nbsp;_]
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053&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(cond&nbsp;(and
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054&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(=&nbsp;(:state&nbsp;cell)&nbsp;:heath)
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055&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;browsing&nbsp;limit&nbsp;really&nbsp;ought&nbsp;to&nbsp;vary&nbsp;with&nbsp;soil&nbsp;fertility,&nbsp;but...
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056&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(&lt;&nbsp;(+&nbsp;(get-int&nbsp;cell&nbsp;:deer)(get-int&nbsp;cell&nbsp;:sheep))&nbsp;6)
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057&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(&lt;&nbsp;(get-int&nbsp;cell&nbsp;:altitude)&nbsp;treeline))
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058&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(merge&nbsp;cell&nbsp;{:state&nbsp;:scrub})))
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059&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn&nbsp;[cell&nbsp;_]&nbsp;(cond&nbsp;(=&nbsp;(:state&nbsp;cell)&nbsp;:scrub)&nbsp;(merge&nbsp;cell&nbsp;{:state&nbsp;:forest})))
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060&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;Forest&nbsp;on&nbsp;fertile&nbsp;land&nbsp;grows&nbsp;to&nbsp;climax
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061&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn&nbsp;[cell&nbsp;_]
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062&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(cond
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063&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(and
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064&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(=&nbsp;(:state&nbsp;cell)&nbsp;:forest)
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065&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(&gt;&nbsp;(get-int&nbsp;cell&nbsp;:fertility)&nbsp;10))
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066&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(merge&nbsp;cell&nbsp;{:state&nbsp;:climax})))
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067&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;Climax&nbsp;forest&nbsp;occasionally&nbsp;catches&nbsp;fire&nbsp;(e.g.&nbsp;lightning&nbsp;strikes)
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068&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn&nbsp;[cell&nbsp;_]&nbsp;(cond&nbsp;(and&nbsp;(=&nbsp;(:state&nbsp;cell)&nbsp;:climax)(&lt;&nbsp;(rand&nbsp;lightning-probability)&nbsp;1))&nbsp;(merge&nbsp;cell&nbsp;{:state&nbsp;:fire})))
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069&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;Climax&nbsp;forest&nbsp;neighbouring&nbsp;fires&nbsp;is&nbsp;likely&nbsp;to&nbsp;catch&nbsp;fire
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070&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn&nbsp;[cell&nbsp;world]
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071&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(cond
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072&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(and&nbsp;(=&nbsp;(:state&nbsp;cell)&nbsp;:climax)
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073&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(&lt;&nbsp;(rand&nbsp;3)&nbsp;1)
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074&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(not&nbsp;(empty?&nbsp;(get-neighbours-with-state&nbsp;world&nbsp;(:x&nbsp;cell)&nbsp;(:y&nbsp;cell)&nbsp;1&nbsp;:fire))))
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<span class="not-covered" title="0 out of 6 forms covered">
075&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(merge&nbsp;cell&nbsp;{:state&nbsp;:fire})))
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076&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;After&nbsp;fire&nbsp;we&nbsp;get&nbsp;waste
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<span class="partial" title="1 out of 14 forms covered">
077&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn&nbsp;[cell&nbsp;_]&nbsp;(cond&nbsp;(=&nbsp;(:state&nbsp;cell)&nbsp;:fire)&nbsp;(merge&nbsp;cell&nbsp;{:state&nbsp;:waste})))
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078&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;And&nbsp;after&nbsp;waste&nbsp;we&nbsp;get&nbsp;pioneer&nbsp;species;&nbsp;if&nbsp;there&#x27;s&nbsp;a&nbsp;woodland&nbsp;seed
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079&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;source,&nbsp;it&#x27;s&nbsp;going&nbsp;to&nbsp;be&nbsp;heath,&nbsp;otherwise&nbsp;grassland.
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080&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn&nbsp;[cell&nbsp;world]
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<span class="not-covered" title="0 out of 2 forms covered">
081&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(cond
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<span class="not-covered" title="0 out of 10 forms covered">
082&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(and&nbsp;(=&nbsp;(:state&nbsp;cell)&nbsp;:waste)
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<span class="not-covered" title="0 out of 1 forms covered">
083&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(not
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<span class="not-covered" title="0 out of 2 forms covered">
084&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(empty?
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<span class="not-covered" title="0 out of 2 forms covered">
085&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(flatten
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<span class="not-covered" title="0 out of 2 forms covered">
086&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(list
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<span class="not-covered" title="0 out of 11 forms covered">
087&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(get-neighbours-with-state&nbsp;world&nbsp;(:x&nbsp;cell)&nbsp;(:y&nbsp;cell)&nbsp;1&nbsp;:scrub)
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<span class="not-covered" title="0 out of 11 forms covered">
088&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(get-neighbours-with-state&nbsp;world&nbsp;(:x&nbsp;cell)&nbsp;(:y&nbsp;cell)&nbsp;1&nbsp;:forest)
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<span class="not-covered" title="0 out of 11 forms covered">
089&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(get-neighbours-with-state&nbsp;world&nbsp;(:x&nbsp;cell)&nbsp;(:y&nbsp;cell)&nbsp;1&nbsp;:climax))))))
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<span class="not-covered" title="0 out of 6 forms covered">
090&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(merge&nbsp;cell&nbsp;{:state&nbsp;:heath})))
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<span class="covered" title="1 out of 1 forms covered">
091&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn&nbsp;[cell&nbsp;_]
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<span class="not-covered" title="0 out of 7 forms covered">
092&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(cond&nbsp;(=&nbsp;(:state&nbsp;cell)&nbsp;:waste)
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<span class="not-covered" title="0 out of 6 forms covered">
093&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(merge&nbsp;cell&nbsp;{:state&nbsp;:grassland})))
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<span class="not-tracked" title="0 out of 0 forms covered">
094&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;Forest&nbsp;increases&nbsp;soil&nbsp;fertility
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<span class="covered" title="1 out of 1 forms covered">
095&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn&nbsp;[cell&nbsp;_]
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<span class="not-covered" title="0 out of 8 forms covered">
096&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(cond&nbsp;(member?&nbsp;(:state&nbsp;cell)&nbsp;&#x27;(:forest&nbsp;:climax))
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<span class="not-covered" title="0 out of 11 forms covered">
097&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(merge&nbsp;cell&nbsp;{:fertility&nbsp;(+&nbsp;(get-int&nbsp;cell&nbsp;:fertility)&nbsp;1)})))))
</span><br/>
<span class="blank" title="0 out of 0 forms covered">
098&nbsp;&nbsp;
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<span class="blank" title="0 out of 0 forms covered">
099&nbsp;&nbsp;
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100&nbsp;&nbsp;;;&nbsp;rules&nbsp;describing&nbsp;herbivore&nbsp;behaviour
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<span class="covered" title="1 out of 1 forms covered">
101&nbsp;&nbsp;(def&nbsp;herbivore-rules
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<span class="covered" title="2 out of 2 forms covered">
102&nbsp;&nbsp;&nbsp;&nbsp;(list
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<span class="not-tracked" title="0 out of 0 forms covered">
103&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;if&nbsp;there&nbsp;are&nbsp;too&nbsp;many&nbsp;deer&nbsp;for&nbsp;the&nbsp;fertility&nbsp;of&nbsp;the&nbsp;area&nbsp;to&nbsp;sustain,
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104&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;some&nbsp;die&nbsp;or&nbsp;move&nbsp;on.
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<span class="covered" title="1 out of 1 forms covered">
105&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn&nbsp;[cell&nbsp;_]
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<span class="not-covered" title="0 out of 11 forms covered">
106&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(cond&nbsp;(&gt;&nbsp;(get-int&nbsp;cell&nbsp;:deer)&nbsp;(get-int&nbsp;cell&nbsp;:fertility))
</span><br/>
<span class="not-covered" title="0 out of 9 forms covered">
107&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(merge&nbsp;cell&nbsp;{:deer&nbsp;(get-int&nbsp;cell&nbsp;:fertility)})))
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
108&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;deer&nbsp;arrive&nbsp;occasionally&nbsp;at&nbsp;the&nbsp;edge&nbsp;of&nbsp;the&nbsp;map.
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<span class="covered" title="1 out of 1 forms covered">
109&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn&nbsp;[cell&nbsp;world]
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<span class="not-covered" title="0 out of 23 forms covered">
110&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(cond&nbsp;(and&nbsp;(&lt;&nbsp;(count&nbsp;(get-neighbours&nbsp;world&nbsp;cell))&nbsp;8)
</span><br/>
<span class="not-covered" title="0 out of 5 forms covered">
111&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(&lt;&nbsp;(rand&nbsp;50)&nbsp;1)
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<span class="not-covered" title="0 out of 6 forms covered">
112&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(&gt;&nbsp;(get-int&nbsp;cell&nbsp;:fertility)&nbsp;0)
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<span class="not-covered" title="0 out of 4 forms covered">
113&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(=&nbsp;(get-int&nbsp;cell&nbsp;:deer)&nbsp;0))
</span><br/>
<span class="not-covered" title="0 out of 6 forms covered">
114&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(merge&nbsp;cell&nbsp;{:deer&nbsp;2})))
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
115&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;deer&nbsp;gradually&nbsp;spread&nbsp;through&nbsp;the&nbsp;world&nbsp;by&nbsp;breeding&nbsp;or&nbsp;migrating.
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<span class="covered" title="1 out of 1 forms covered">
116&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn&nbsp;[cell&nbsp;world]
</span><br/>
<span class="not-covered" title="0 out of 15 forms covered">
117&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(let&nbsp;[n&nbsp;(apply&nbsp;+&nbsp;(map&nbsp;#(get-int&nbsp;%&nbsp;:deer)&nbsp;(get-neighbours&nbsp;world&nbsp;cell)))]
</span><br/>
<span class="not-covered" title="0 out of 12 forms covered">
118&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(cond&nbsp;(and
</span><br/>
<span class="not-covered" title="0 out of 6 forms covered">
119&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(&gt;&nbsp;(get-int&nbsp;cell&nbsp;:fertility)&nbsp;0)
</span><br/>
<span class="not-covered" title="0 out of 6 forms covered">
120&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(=&nbsp;(get-int&nbsp;cell&nbsp;:deer)&nbsp;0)
</span><br/>
<span class="not-covered" title="0 out of 1 forms covered">
121&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(&gt;=&nbsp;n&nbsp;2))
</span><br/>
<span class="not-covered" title="0 out of 9 forms covered">
122&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(merge&nbsp;cell&nbsp;{:deer&nbsp;(int&nbsp;(&#x2F;&nbsp;n&nbsp;2))}))))
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
123&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;deer&nbsp;breed.
</span><br/>
<span class="covered" title="1 out of 1 forms covered">
124&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn&nbsp;[cell&nbsp;_]
</span><br/>
<span class="not-covered" title="0 out of 2 forms covered">
125&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(cond
</span><br/>
<span class="not-covered" title="0 out of 6 forms covered">
126&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(&gt;=&nbsp;(get-int&nbsp;cell&nbsp;:deer)&nbsp;2)
</span><br/>
<span class="not-covered" title="0 out of 11 forms covered">
127&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(merge&nbsp;cell&nbsp;{:deer&nbsp;(int&nbsp;(*&nbsp;(:deer&nbsp;cell)&nbsp;2))})))))
</span><br/>
<span class="blank" title="0 out of 0 forms covered">
128&nbsp;&nbsp;
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
129&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;rules&nbsp;describing&nbsp;predator&nbsp;behaviour
</span><br/>
<span class="covered" title="1 out of 1 forms covered">
130&nbsp;&nbsp;&nbsp;&nbsp;(def&nbsp;predator-rules
</span><br/>
<span class="covered" title="2 out of 2 forms covered">
131&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(list
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
132&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;wolves&nbsp;eat&nbsp;deer
</span><br/>
<span class="covered" title="1 out of 1 forms covered">
133&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn&nbsp;[cell&nbsp;_]
</span><br/>
<span class="not-covered" title="0 out of 2 forms covered">
134&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(cond
</span><br/>
<span class="not-covered" title="0 out of 6 forms covered">
135&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(&gt;=&nbsp;(get-int&nbsp;cell&nbsp;:wolves)&nbsp;1)
</span><br/>
<span class="not-covered" title="0 out of 16 forms covered">
136&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(merge&nbsp;cell&nbsp;{:deer&nbsp;(max&nbsp;0&nbsp;(-&nbsp;(get-int&nbsp;cell&nbsp;:deer)&nbsp;(get-int&nbsp;cell&nbsp;:wolves)))})))
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
137&nbsp;&nbsp;;;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;not&nbsp;more&nbsp;than&nbsp;eight&nbsp;wolves&nbsp;in&nbsp;a&nbsp;pack,&nbsp;for&nbsp;now&nbsp;(hack&nbsp;because&nbsp;wolves&nbsp;are&nbsp;not&nbsp;dying)
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
138&nbsp;&nbsp;;;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn&nbsp;[cell&nbsp;world]
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
139&nbsp;&nbsp;;;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(cond&nbsp;(&gt;&nbsp;(get-int&nbsp;cell&nbsp;:wolves)&nbsp;8)&nbsp;(merge&nbsp;cell&nbsp;{:wolves&nbsp;8})))
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
140&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;if&nbsp;there&nbsp;are&nbsp;not&nbsp;enough&nbsp;deer&nbsp;to&nbsp;sustain&nbsp;the&nbsp;get-int&nbsp;of&nbsp;wolves,
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
141&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;some&nbsp;wolves&nbsp;die&nbsp;or&nbsp;move&nbsp;on.&nbsp;(doesn&#x27;t&nbsp;seem&nbsp;to&nbsp;be&nbsp;working?)
</span><br/>
<span class="covered" title="1 out of 1 forms covered">
142&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn&nbsp;[cell&nbsp;_]
</span><br/>
<span class="not-covered" title="0 out of 11 forms covered">
143&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(cond&nbsp;(&gt;&nbsp;(get-int&nbsp;cell&nbsp;:wolves)&nbsp;(get-int&nbsp;cell&nbsp;:deer))
</span><br/>
<span class="not-covered" title="0 out of 6 forms covered">
144&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(merge&nbsp;cell&nbsp;{:wolves&nbsp;0})))
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
145&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;wolves&nbsp;arrive&nbsp;occasionally&nbsp;at&nbsp;the&nbsp;edge&nbsp;of&nbsp;the&nbsp;map.
</span><br/>
<span class="covered" title="1 out of 1 forms covered">
146&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn&nbsp;[cell&nbsp;world]
</span><br/>
<span class="not-covered" title="0 out of 23 forms covered">
147&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(cond&nbsp;(and&nbsp;(&lt;&nbsp;(count&nbsp;(get-neighbours&nbsp;world&nbsp;cell))&nbsp;8)
</span><br/>
<span class="not-covered" title="0 out of 5 forms covered">
148&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(&lt;&nbsp;(rand&nbsp;50)&nbsp;1)
</span><br/>
<span class="not-covered" title="0 out of 7 forms covered">
149&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(not&nbsp;(=&nbsp;(:state&nbsp;cell)&nbsp;:water))
</span><br/>
<span class="not-covered" title="0 out of 4 forms covered">
150&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(=&nbsp;(get-int&nbsp;cell&nbsp;:wolves)&nbsp;0))
</span><br/>
<span class="not-covered" title="0 out of 6 forms covered">
151&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(merge&nbsp;cell&nbsp;{:wolves&nbsp;2})))
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
152&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;wolves&nbsp;gradually&nbsp;spread&nbsp;through&nbsp;the&nbsp;world&nbsp;by&nbsp;breeding&nbsp;or&nbsp;migrating.
</span><br/>
<span class="covered" title="1 out of 1 forms covered">
153&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn&nbsp;[cell&nbsp;world]
</span><br/>
<span class="not-covered" title="0 out of 15 forms covered">
154&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(let&nbsp;[n&nbsp;(apply&nbsp;+&nbsp;(map&nbsp;#(get-int&nbsp;%&nbsp;:wolves)&nbsp;(get-neighbours&nbsp;world&nbsp;cell)))]
</span><br/>
<span class="not-covered" title="0 out of 12 forms covered">
155&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(cond&nbsp;(and
</span><br/>
<span class="not-covered" title="0 out of 7 forms covered">
156&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(not&nbsp;(=&nbsp;(:state&nbsp;cell)&nbsp;:water))
</span><br/>
<span class="not-covered" title="0 out of 6 forms covered">
157&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(=&nbsp;(get-int&nbsp;cell&nbsp;:wolves)&nbsp;0)
</span><br/>
<span class="not-covered" title="0 out of 1 forms covered">
158&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(&gt;=&nbsp;n&nbsp;2))
</span><br/>
<span class="not-covered" title="0 out of 6 forms covered">
159&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(merge&nbsp;cell&nbsp;{:wolves&nbsp;2}))))
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
160&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;wolves&nbsp;breed.
</span><br/>
<span class="covered" title="1 out of 1 forms covered">
161&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn&nbsp;[cell&nbsp;_]
</span><br/>
<span class="not-covered" title="0 out of 2 forms covered">
162&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(cond
</span><br/>
<span class="not-covered" title="0 out of 6 forms covered">
163&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(&gt;=&nbsp;(get-int&nbsp;cell&nbsp;:wolves)&nbsp;2)
</span><br/>
<span class="not-covered" title="0 out of 11 forms covered">
164&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(merge&nbsp;cell&nbsp;{:wolves&nbsp;(int&nbsp;(*&nbsp;(:wolves&nbsp;cell)&nbsp;2))})))))
</span><br/>
<span class="blank" title="0 out of 0 forms covered">
165&nbsp;&nbsp;
</span><br/>
<span class="blank" title="0 out of 0 forms covered">
166&nbsp;&nbsp;
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
167&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;rules&nbsp;which&nbsp;initialise&nbsp;the&nbsp;world
</span><br/>
<span class="covered" title="1 out of 1 forms covered">
168&nbsp;&nbsp;&nbsp;&nbsp;(def&nbsp;init-rules
</span><br/>
<span class="covered" title="2 out of 2 forms covered">
169&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(list
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
170&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;below&nbsp;the&nbsp;waterline,&nbsp;we&nbsp;have&nbsp;water.
</span><br/>
<span class="covered" title="1 out of 1 forms covered">
171&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn&nbsp;[cell&nbsp;_]
</span><br/>
<span class="not-covered" title="0 out of 23 forms covered">
172&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(cond&nbsp;(and&nbsp;(=&nbsp;(:state&nbsp;cell)&nbsp;:new)&nbsp;(&lt;&nbsp;(get-int&nbsp;cell&nbsp;:altitude)&nbsp;waterline))&nbsp;(merge&nbsp;cell&nbsp;{:state&nbsp;:water})))
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
173&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;above&nbsp;the&nbsp;snowline,&nbsp;we&nbsp;have&nbsp;snow.
</span><br/>
<span class="covered" title="1 out of 1 forms covered">
174&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn&nbsp;[cell&nbsp;_]
</span><br/>
<span class="not-covered" title="0 out of 23 forms covered">
175&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(cond&nbsp;(and&nbsp;(=&nbsp;(:state&nbsp;cell)&nbsp;:new)&nbsp;(&gt;&nbsp;(get-int&nbsp;cell&nbsp;:altitude)&nbsp;snowline))&nbsp;(merge&nbsp;cell&nbsp;{:state&nbsp;:snow})))
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
176&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;in&nbsp;between,&nbsp;we&nbsp;have&nbsp;a&nbsp;wasteland.
</span><br/>
<span class="partial" title="1 out of 14 forms covered">
177&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn&nbsp;[cell&nbsp;_]&nbsp;(cond&nbsp;(=&nbsp;(:state&nbsp;cell)&nbsp;:new)&nbsp;(merge&nbsp;cell&nbsp;{:state&nbsp;:grassland})))))
</span><br/>
<span class="blank" title="0 out of 0 forms covered">
178&nbsp;&nbsp;
</span><br/>
<span class="blank" title="0 out of 0 forms covered">
179&nbsp;&nbsp;
</span><br/>
<span class="covered" title="3 out of 3 forms covered">
180&nbsp;&nbsp;(def&nbsp;natural-rules&nbsp;(flatten
</span><br/>
<span class="covered" title="2 out of 2 forms covered">
181&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(list
</span><br/>
<span class="covered" title="1 out of 1 forms covered">
182&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;vegetation-rules
</span><br/>
<span class="covered" title="1 out of 1 forms covered">
183&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;herbivore-rules
</span><br/>
<span class="covered" title="1 out of 1 forms covered">
184&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;predator-rules)))
</span><br/>
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