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<link rel="stylesheet" href="../coverage.css"/> <title> mw_engine/core.clj </title>
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001&nbsp;&nbsp;(ns&nbsp;^{:doc&nbsp;&quot;Functions&nbsp;to&nbsp;transform&nbsp;a&nbsp;world&nbsp;and&nbsp;run&nbsp;rules.
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002&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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003&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Every&nbsp;rule&nbsp;is&nbsp;a&nbsp;function&nbsp;of&nbsp;two&nbsp;arguments,&nbsp;a&nbsp;cell&nbsp;and&nbsp;a&nbsp;world.&nbsp;If&nbsp;the&nbsp;rule
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004&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;fires,&nbsp;it&nbsp;returns&nbsp;a&nbsp;new&nbsp;cell,&nbsp;which&nbsp;should&nbsp;have&nbsp;the&nbsp;same&nbsp;values&nbsp;for&nbsp;`:x`&nbsp;and
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005&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;`:y`&nbsp;as&nbsp;the&nbsp;old&nbsp;cell.&nbsp;Anything&nbsp;else&nbsp;can&nbsp;be&nbsp;modified.
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006&nbsp;&nbsp;
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007&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;While&nbsp;any&nbsp;function&nbsp;of&nbsp;two&nbsp;arguments&nbsp;can&nbsp;be&nbsp;used&nbsp;as&nbsp;a&nbsp;rule,&nbsp;a&nbsp;special&nbsp;high
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008&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;level&nbsp;rule&nbsp;language&nbsp;is&nbsp;provided&nbsp;by&nbsp;the&nbsp;`mw-parser`&nbsp;package,&nbsp;which&nbsp;compiles
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009&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;rules&nbsp;expressed&nbsp;in&nbsp;a&nbsp;subset&nbsp;of&nbsp;English&nbsp;rules&nbsp;into&nbsp;suitable&nbsp;functions.
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010&nbsp;&nbsp;
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011&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A&nbsp;cell&nbsp;is&nbsp;a&nbsp;map&nbsp;containing&nbsp;at&nbsp;least&nbsp;values&nbsp;for&nbsp;the&nbsp;keys&nbsp;:x,&nbsp;:y,&nbsp;and&nbsp;:state;
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012&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a&nbsp;transformation&nbsp;should&nbsp;not&nbsp;alter&nbsp;the&nbsp;values&nbsp;of&nbsp;:x&nbsp;or&nbsp;:y,&nbsp;and&nbsp;should&nbsp;not
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013&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;a&nbsp;cell&nbsp;without&nbsp;a&nbsp;keyword&nbsp;as&nbsp;the&nbsp;value&nbsp;of&nbsp;:state.&nbsp;Anything&nbsp;else&nbsp;is
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014&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;legal.
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015&nbsp;&nbsp;
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016&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A&nbsp;world&nbsp;is&nbsp;a&nbsp;two&nbsp;dimensional&nbsp;matrix&nbsp;(sequence&nbsp;of&nbsp;sequences)&nbsp;of&nbsp;cells,&nbsp;such
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017&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;that&nbsp;every&nbsp;cell&#x27;s&nbsp;`:x`&nbsp;and&nbsp;`:y`&nbsp;properties&nbsp;reflect&nbsp;its&nbsp;place&nbsp;in&nbsp;the&nbsp;matrix.
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018&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;See&nbsp;`world.clj`.
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019&nbsp;&nbsp;
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020&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Each&nbsp;time&nbsp;the&nbsp;world&nbsp;is&nbsp;transformed&nbsp;(see&nbsp;`transform-world`),&nbsp;for&nbsp;each&nbsp;cell,
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021&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;rules&nbsp;are&nbsp;applied&nbsp;in&nbsp;turn&nbsp;until&nbsp;one&nbsp;matches.&nbsp;Once&nbsp;one&nbsp;rule&nbsp;has&nbsp;matched&nbsp;no
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022&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;further&nbsp;rules&nbsp;can&nbsp;be&nbsp;applied&nbsp;to&nbsp;that&nbsp;cell.&quot;
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023&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:author&nbsp;&quot;Simon&nbsp;Brooke&quot;}
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024&nbsp;&nbsp;&nbsp;mw-engine.core
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025&nbsp;&nbsp;&nbsp;&nbsp;(:require&nbsp;[mw-engine.flow&nbsp;:refer&nbsp;[flow-world]]
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026&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[mw-engine.utils&nbsp;:refer&nbsp;[add-history-event&nbsp;get-int-or-zero&nbsp;map-world&nbsp;rule-type]]
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027&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[taoensso.timbre&nbsp;:as&nbsp;l]))
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028&nbsp;&nbsp;
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029&nbsp;&nbsp;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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030&nbsp;&nbsp;;;;;
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031&nbsp;&nbsp;;;;;&nbsp;mw-engine:&nbsp;the&nbsp;state&#x2F;transition&nbsp;engine&nbsp;of&nbsp;MicroWorld.
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032&nbsp;&nbsp;;;;;
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033&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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034&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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035&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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036&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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037&nbsp;&nbsp;;;;;
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038&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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039&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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040&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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041&nbsp;&nbsp;;;;;&nbsp;GNU&nbsp;General&nbsp;Public&nbsp;License&nbsp;for&nbsp;more&nbsp;details.
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042&nbsp;&nbsp;;;;;
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043&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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044&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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045&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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046&nbsp;&nbsp;;;;;&nbsp;USA.
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047&nbsp;&nbsp;;;;;
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048&nbsp;&nbsp;;;;;&nbsp;Copyright&nbsp;(C)&nbsp;2014&nbsp;Simon&nbsp;Brooke
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049&nbsp;&nbsp;;;;;
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050&nbsp;&nbsp;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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051&nbsp;&nbsp;
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052&nbsp;&nbsp;(def&nbsp;^:dynamic&nbsp;*with-history*
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053&nbsp;&nbsp;&nbsp;&nbsp;&quot;I&nbsp;suspect&nbsp;that&nbsp;caching&nbsp;history&nbsp;on&nbsp;the&nbsp;cells&nbsp;is&nbsp;greatly&nbsp;worsening&nbsp;the
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054&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;memory&nbsp;problems.&nbsp;Make&nbsp;it&nbsp;optional,&nbsp;but&nbsp;by&nbsp;default&nbsp;false.&quot;
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055&nbsp;&nbsp;&nbsp;&nbsp;false)
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056&nbsp;&nbsp;
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057&nbsp;&nbsp;(defn&nbsp;apply-rule
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058&nbsp;&nbsp;&nbsp;&nbsp;&quot;Apply&nbsp;a&nbsp;single&nbsp;`rule`&nbsp;to&nbsp;a&nbsp;`cell`.&nbsp;What&nbsp;this&nbsp;is&nbsp;about&nbsp;is&nbsp;that&nbsp;I&nbsp;want&nbsp;to&nbsp;be&nbsp;able,
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059&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;for&nbsp;debugging&nbsp;purposes,&nbsp;to&nbsp;tag&nbsp;a&nbsp;cell&nbsp;with&nbsp;the&nbsp;rule&nbsp;text&nbsp;of&nbsp;the&nbsp;rule&nbsp;which
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060&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;fired&nbsp;(and&nbsp;especially&nbsp;so&nbsp;when&nbsp;an&nbsp;exception&nbsp;is&nbsp;thrown).&nbsp;&quot;
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061&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;as&nbsp;of&nbsp;version&nbsp;0-3-0,&nbsp;metadata&nbsp;for&nbsp;rules&nbsp;is&nbsp;now&nbsp;passed&nbsp;around&nbsp;on&nbsp;the&nbsp;metadata
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062&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;of&nbsp;the&nbsp;rule&nbsp;function&nbsp;itself.&nbsp;Yes,&nbsp;I&nbsp;know,&nbsp;this&nbsp;is&nbsp;obvious;&nbsp;but&nbsp;I&#x27;ll&nbsp;confess
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063&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;I&nbsp;didn&#x27;t&nbsp;think&nbsp;of&nbsp;it&nbsp;before.
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064&nbsp;&nbsp;&nbsp;&nbsp;[world&nbsp;cell&nbsp;rule]
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<span class="covered" title="2 out of 2 forms covered">
065&nbsp;&nbsp;&nbsp;&nbsp;(let&nbsp;[result&nbsp;(try
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<span class="covered" title="7 out of 7 forms covered">
066&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(apply&nbsp;rule&nbsp;(list&nbsp;cell&nbsp;world))
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067&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(catch&nbsp;Exception&nbsp;e
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<span class="not-covered" title="0 out of 16 forms covered">
068&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(l&#x2F;warn&nbsp;e
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069&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(format
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070&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&quot;Error&nbsp;in&nbsp;`apply-rule`:&nbsp;`%s`&nbsp;(%s)&nbsp;while&nbsp;executing&nbsp;rule&nbsp;`%s`&nbsp;on&nbsp;cell&nbsp;`%s`&quot;
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<span class="not-covered" title="0 out of 1 forms covered">
071&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;e
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<span class="not-covered" title="0 out of 1 forms covered">
072&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(.getMessage&nbsp;e)
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<span class="not-covered" title="0 out of 5 forms covered">
073&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(-&gt;&nbsp;rule&nbsp;meta&nbsp;:lisp)
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<span class="not-covered" title="0 out of 1 forms covered">
074&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;cell))))]
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<span class="covered" title="2 out of 2 forms covered">
075&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(if&nbsp;*with-history*
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<span class="covered" title="4 out of 4 forms covered">
076&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(add-history-event&nbsp;result&nbsp;rule)
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077&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;result)))
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<span class="blank" title="0 out of 0 forms covered">
078&nbsp;&nbsp;
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<span class="covered" title="1 out of 1 forms covered">
079&nbsp;&nbsp;(defn-&nbsp;apply-rules
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<span class="not-tracked" title="0 out of 0 forms covered">
080&nbsp;&nbsp;&nbsp;&nbsp;&quot;Derive&nbsp;a&nbsp;cell&nbsp;from&nbsp;this&nbsp;`cell`&nbsp;of&nbsp;this&nbsp;`world`&nbsp;by&nbsp;applying&nbsp;these&nbsp;`rules`.&quot;
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081&nbsp;&nbsp;&nbsp;&nbsp;[world&nbsp;cell&nbsp;rules]
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<span class="partial" title="4 out of 5 forms covered">
082&nbsp;&nbsp;&nbsp;&nbsp;(or
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<span class="covered" title="2 out of 2 forms covered">
083&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(first
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<span class="covered" title="2 out of 2 forms covered">
084&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(remove
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<span class="covered" title="1 out of 1 forms covered">
085&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;nil?
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<span class="covered" title="1 out of 1 forms covered">
086&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(try
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<span class="covered" title="9 out of 9 forms covered">
087&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(map&nbsp;#(apply-rule&nbsp;world&nbsp;cell&nbsp;%)&nbsp;rules)
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<span class="not-tracked" title="0 out of 0 forms covered">
088&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(catch&nbsp;Exception&nbsp;e
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<span class="not-covered" title="0 out of 16 forms covered">
089&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(l&#x2F;warn&nbsp;e
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<span class="not-covered" title="0 out of 3 forms covered">
090&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(format
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<span class="not-tracked" title="0 out of 0 forms covered">
091&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&quot;Error&nbsp;in&nbsp;`apply-rules`:&nbsp;`%s`&nbsp;(%s)&nbsp;while&nbsp;executing&nbsp;rules&nbsp;on&nbsp;cell&nbsp;`%s`&quot;
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<span class="not-covered" title="0 out of 2 forms covered">
092&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(-&gt;&nbsp;e&nbsp;.getClass&nbsp;.getName)
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<span class="not-covered" title="0 out of 1 forms covered">
093&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(.getMessage&nbsp;e)
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<span class="not-covered" title="0 out of 1 forms covered">
094&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;cell))))))
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<span class="not-tracked" title="0 out of 0 forms covered">
095&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;cell))
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096&nbsp;&nbsp;
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<span class="covered" title="1 out of 1 forms covered">
097&nbsp;&nbsp;(defn-&nbsp;transform-cell
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<span class="not-tracked" title="0 out of 0 forms covered">
098&nbsp;&nbsp;&nbsp;&nbsp;&quot;Derive&nbsp;a&nbsp;cell&nbsp;from&nbsp;this&nbsp;`cell`&nbsp;of&nbsp;this&nbsp;`world`&nbsp;by&nbsp;applying&nbsp;these&nbsp;`rules`.&nbsp;If&nbsp;an
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<span class="not-tracked" title="0 out of 0 forms covered">
099&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;exception&nbsp;is&nbsp;thrown,&nbsp;cache&nbsp;its&nbsp;message&nbsp;on&nbsp;the&nbsp;cell&nbsp;and&nbsp;set&nbsp;it&#x27;s&nbsp;state&nbsp;to&nbsp;error&quot;
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<span class="not-tracked" title="0 out of 0 forms covered">
100&nbsp;&nbsp;&nbsp;&nbsp;[world&nbsp;cell&nbsp;rules]
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<span class="covered" title="1 out of 1 forms covered">
101&nbsp;&nbsp;&nbsp;&nbsp;(try
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<span class="covered" title="2 out of 2 forms covered">
102&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(merge
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<span class="covered" title="5 out of 5 forms covered">
103&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(apply-rules&nbsp;world&nbsp;cell&nbsp;rules)
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<span class="covered" title="8 out of 8 forms covered">
104&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{:generation&nbsp;(+&nbsp;(get-int-or-zero&nbsp;cell&nbsp;:generation)&nbsp;1)})
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
105&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(catch&nbsp;Exception&nbsp;e
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<span class="not-covered" title="0 out of 4 forms covered">
106&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(let&nbsp;[narrative&nbsp;(format&nbsp;&quot;Error&nbsp;in&nbsp;`transform-cell`:&nbsp;`%s`&nbsp;(%s)&nbsp;at&nbsp;generation&nbsp;%d&nbsp;when&nbsp;in&nbsp;state&nbsp;%s;&quot;
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<span class="not-covered" title="0 out of 2 forms covered">
107&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(-&gt;&nbsp;e&nbsp;.getClass&nbsp;.getName)
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<span class="not-covered" title="0 out of 1 forms covered">
108&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(.getMessage&nbsp;e)
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<span class="not-covered" title="0 out of 3 forms covered">
109&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(:generation&nbsp;cell)
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<span class="not-covered" title="0 out of 3 forms covered">
110&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(:state&nbsp;cell))]
</span><br/>
<span class="not-covered" title="0 out of 17 forms covered">
111&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(l&#x2F;warn&nbsp;e&nbsp;narrative)
</span><br/>
<span class="not-covered" title="0 out of 1 forms covered">
112&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;cell))))
</span><br/>
<span class="blank" title="0 out of 0 forms covered">
113&nbsp;&nbsp;
</span><br/>
<span class="covered" title="1 out of 1 forms covered">
114&nbsp;&nbsp;(defn&nbsp;transform-world
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
115&nbsp;&nbsp;&nbsp;&nbsp;&quot;Return&nbsp;a&nbsp;world&nbsp;derived&nbsp;from&nbsp;this&nbsp;`world`&nbsp;by&nbsp;applying&nbsp;the&nbsp;production&nbsp;rules&nbsp;
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
116&nbsp;&nbsp;&nbsp;&nbsp;found&nbsp;among&nbsp;these&nbsp;`rules`&nbsp;to&nbsp;each&nbsp;cell.&quot;
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
117&nbsp;&nbsp;&nbsp;&nbsp;[world&nbsp;rules]
</span><br/>
<span class="covered" title="4 out of 4 forms covered">
118&nbsp;&nbsp;&nbsp;&nbsp;(map-world&nbsp;world&nbsp;transform-cell
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
119&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;Yes,&nbsp;that&nbsp;`list`&nbsp;is&nbsp;there&nbsp;for&nbsp;a&nbsp;reason!&nbsp;
</span><br/>
<span class="covered" title="2 out of 2 forms covered">
120&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(list
</span><br/>
<span class="covered" title="3 out of 3 forms covered">
121&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(filter
</span><br/>
<span class="covered" title="5 out of 5 forms covered">
122&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;#(=&nbsp;:production&nbsp;(rule-type&nbsp;%))
</span><br/>
<span class="covered" title="1 out of 1 forms covered">
123&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;rules))))
</span><br/>
<span class="blank" title="0 out of 0 forms covered">
124&nbsp;&nbsp;
</span><br/>
<span class="covered" title="1 out of 1 forms covered">
125&nbsp;&nbsp;(defn&nbsp;run-world
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
126&nbsp;&nbsp;&nbsp;&nbsp;&quot;Run&nbsp;this&nbsp;world&nbsp;with&nbsp;these&nbsp;rules&nbsp;for&nbsp;this&nbsp;number&nbsp;of&nbsp;generations.
</span><br/>
<span class="blank" title="0 out of 0 forms covered">
127&nbsp;&nbsp;
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
128&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;`world`&nbsp;a&nbsp;world&nbsp;as&nbsp;discussed&nbsp;above;
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
129&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;`init-rules`&nbsp;a&nbsp;sequence&nbsp;of&nbsp;rules&nbsp;as&nbsp;defined&nbsp;above,&nbsp;to&nbsp;be&nbsp;run&nbsp;once&nbsp;to&nbsp;initialise&nbsp;the&nbsp;world;
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
130&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;`rules`&nbsp;a&nbsp;sequence&nbsp;of&nbsp;rules&nbsp;as&nbsp;defined&nbsp;above,&nbsp;to&nbsp;be&nbsp;run&nbsp;iteratively&nbsp;for&nbsp;each&nbsp;generation;
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
131&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;`generations`&nbsp;an&nbsp;(integer)&nbsp;number&nbsp;of&nbsp;generations.
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
132&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
133&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**NOTE&nbsp;THAT**&nbsp;all&nbsp;rules&nbsp;**must**&nbsp;be&nbsp;tagged&nbsp;with&nbsp;`rule-type`&nbsp;metadata,&nbsp;or&nbsp;thet&nbsp;**will&nbsp;not**
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
134&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;be&nbsp;executed.
</span><br/>
<span class="blank" title="0 out of 0 forms covered">
135&nbsp;&nbsp;
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
136&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return&nbsp;the&nbsp;final&nbsp;generation&nbsp;of&nbsp;the&nbsp;world.&quot;
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
137&nbsp;&nbsp;&nbsp;&nbsp;([world&nbsp;rules&nbsp;generations]
</span><br/>
<span class="not-covered" title="0 out of 7 forms covered">
138&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(run-world&nbsp;world&nbsp;rules&nbsp;rules&nbsp;(dec&nbsp;generations)))
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
139&nbsp;&nbsp;&nbsp;&nbsp;([world&nbsp;init-rules&nbsp;rules&nbsp;generations]
</span><br/>
<span class="not-covered" title="0 out of 3 forms covered">
140&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(reduce&nbsp;(fn&nbsp;[world&nbsp;iteration]
</span><br/>
<span class="not-covered" title="0 out of 17 forms covered">
141&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(l&#x2F;info&nbsp;&quot;Running&nbsp;iteration&nbsp;&quot;&nbsp;iteration)
</span><br/>
<span class="not-covered" title="0 out of 5 forms covered">
142&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(let&nbsp;[w&#x27;&nbsp;(transform-world&nbsp;world&nbsp;rules)]
</span><br/>
<span class="not-covered" title="0 out of 4 forms covered">
143&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(flow-world&nbsp;w&#x27;&nbsp;rules)))
</span><br/>
<span class="not-covered" title="0 out of 4 forms covered">
144&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(transform-world&nbsp;world&nbsp;init-rules)
</span><br/>
<span class="not-covered" title="0 out of 3 forms covered">
145&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(range&nbsp;generations))))
</span><br/>
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