<snapdata remixID="14253204"><project name="U3L1-TicTacToeU3L33/25" app="Snap! 10.4.6, https://snap.berkeley.edu" version="2"><notes></notes><thumbnail>data:image/png;base64,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</thumbnail><scenes select="1"><scene name="U3L1-TicTacToeU3L33/25"><notes></notes><hidden></hidden><headers></headers><code></code><blocks><block-definition s="join words %&apos;words&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%mult%txt"></input></inputs><script><block s="doWarp"><script><block s="doIf"><block s="reportListIsEmpty"><block s="reportCDR"><block var="words"/></block></block><script><block s="doReport"><block s="reportListItem"><l>1</l><block var="words"/></block></block></script><list></list></block><block s="doIf"><block s="reportVariadicEquals"><list><l></l><block s="reportListItem"><l>1</l><block var="words"/></block></list></block><script><block s="doReport"><custom-block s="join words %mult%txt"><block s="reportCDR"><block var="words"/></block></custom-block></block></script><list></list></block><block s="doIf"><block s="reportVariadicEquals"><list><l></l><block s="reportListItem"><l>2</l><block var="words"/></block></list></block><script><block s="doReport"><custom-block s="join words %mult%txt"><block s="reportCONS"><block s="reportListItem"><l>1</l><block var="words"/></block><block s="reportCDR"><block s="reportCDR"><block var="words"/></block></block></block></custom-block></block></script><list></list></block><block s="doReport"><block s="reportJoinWords"><list><block s="reportListItem"><l>1</l><block var="words"/></block><l> </l><custom-block s="join words %mult%txt"><block s="reportCDR"><block var="words"/></block></custom-block></list></block></block></script></block></script><scripts><script x="229.00000300000002" y="196.77778077777774"><block s="reportJoinWords"><list><l></l><l></l></list></block></script></scripts></block-definition><block-definition s="ignore %&apos;x&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s"></input></inputs></block-definition><block-definition s="makeBoard" type="command" category="other"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doSwitchToCostume"><l>Empty</l></block><block s="show"></block><block s="doSetVar"><l>position number</l><l>1</l></block><custom-block s="for %upvar = %n to %n %cs"><l>i</l><l>1</l><l>3</l><script><custom-block s="for %upvar = %n to %n %cs"><l>j</l><l>1</l><l>3</l><script><block s="gotoXY"><block s="reportVariadicSum"><list><l>-100</l><block s="reportVariadicProduct"><list><l>50</l><block var="j"/></list></block></list></block><block s="reportDifference"><l>100</l><block s="reportVariadicProduct"><list><l>50</l><block var="i"/></list></block></block></block><block s="createClone"><l><option>myself</option></l></block><block s="doChangeVar"><l>position number</l><l>1</l></block></script></custom-block></script></custom-block><block s="hide"></block></script></block-definition><block-definition s="won? %&apos;who&apos;" type="predicate" category="operators"><header></header><code></code><translations></translations><inputs><input type="%s"></input></inputs><script><block s="doReport"><block s="reportListContainsItem"><custom-block s="status of all winning triples"></custom-block><block s="reportNewList"><list><block var="who"/><block var="who"/><block var="who"/></list></block></block></block></script></block-definition><block-definition s="possible winning triplets" type="reporter" category="variables"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doReport"><block s="reportNewList"><list><block s="reportNewList"><list><l>1</l><l>2</l><l>3</l></list></block><block s="reportNewList"><list><l>4</l><l>5</l><l>6</l></list></block><block s="reportNewList"><list><l>7</l><l>8</l><l>9</l></list></block><block s="reportNewList"><list><l>1</l><l>4</l><l>7</l></list></block><block s="reportNewList"><list><l>2</l><l>5</l><l>8</l></list></block><block s="reportNewList"><list><l>3</l><l>6</l><l>9</l></list></block><block s="reportNewList"><list><l>1</l><l>5</l><l>9</l></list></block><block s="reportNewList"><list><l>3</l><l>5</l><l>7</l></list></block></list></block></block></script></block-definition><block-definition s="status of triple %&apos;triple&apos;" type="reporter" category="variables"><header></header><code></code><translations></translations><inputs><input type="%s" initial="1"></input></inputs><script><block s="doReport"><block s="reportMap"><block s="reifyReporter"><autolambda><block s="reportListItem"><l></l><block var="board"/></block></autolambda><list></list></block><block var="triple"/></block></block></script></block-definition><block-definition s="status of all winning triples" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doReport"><block s="reportMap"><block s="reifyReporter"><autolambda><custom-block s="status of triple %l"><l/></custom-block></autolambda><list></list></block><custom-block s="possible winning triples"></custom-block></block></block></script></block-definition><block-definition s="tied?" type="predicate" category="operators"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doReport"><block s="reportVariadicEquals"><list><block s="reportFindFirst"><block s="reifyPredicate"><autolambda><block s="reportIsA"><l></l><l><option>number</option></l></block></autolambda><list></list></block><block var="board"/></block><l></l></list></block></block></script></block-definition><block-definition s="opponent" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doReport"><l></l></block></script></block-definition><block-definition s="move in this square" type="command" category="motion"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doIfElse"><block var="X&apos;s turn?"/><script><block s="doSwitchToCostume"><l>X</l></block><block s="doReplaceInList"><block var="position number"/><block var="board"/><l>X</l></block><block s="doIfElse"><custom-block s="won? %s"><l>X</l></custom-block><script><block s="doSayFor"><l>X won!</l><l>1</l></block><block s="doBroadcast"><l><option>__shout__go__</option></l><list></list></block></script><script><block s="doBroadcast"><custom-block s="next move for computer"><comment w="53.333333333333336" collapsed="true">5.6.4.3</comment></custom-block><list></list></block><block s="doIf"><custom-block s="tied?"></custom-block><script><block s="doSayFor"><l>It&apos;s a tie try again</l><l>1</l></block><block s="doBroadcast"><l><option>__shout__go__</option></l><list></list></block></script><list></list></block></script></block></script><script><block s="doSwitchToCostume"><l>O</l></block><block s="doReplaceInList"><block var="position number"/><block var="board"/><l>O</l></block><block s="doIf"><custom-block s="won? %s"><l>O</l></custom-block><script><block s="doSayFor"><l>O won!</l><l>2</l></block><block s="doBroadcast"><l><option>__shout__go__</option></l><list></list></block></script><list></list></block></script></block><block s="doSetVar"><l>X&apos;s turn?</l><block s="reportNot"><block var="X&apos;s turn?"/></block></block></script></block-definition><block-definition s="next move for computer" type="reporter" category="other"><comment w="53.333333333333336" collapsed="true">5.6.4.3</comment><header></header><code></code><translations></translations><inputs></inputs><script><block s="doIf"><custom-block s="can player %s win now?"><l>O</l><comment w="126" collapsed="true">First rule: win if I can.</comment></custom-block><script><block s="doReport"><custom-block s="winning square for player %s"><l>O</l></custom-block></block></script><list></list></block><block s="doIf"><custom-block s="can player %s win now?"><l>X</l><comment w="192.66666666666666" collapsed="true">Second rule: block opponent&apos;s win.</comment></custom-block><script><block s="doReport"><custom-block s="winning square for player %s"><l>X</l></custom-block></block></script><list></list></block><block s="doReport"><custom-block s="best empty square"></custom-block><comment w="165.33333333333334" collapsed="true">Fallback: move somewhere!</comment></block></script></block-definition><block-definition s="best empty square" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doReport"><block s="reportFindFirst"><block s="reifyPredicate"><autolambda><block s="reportListContainsItem"><block var="board"/><l></l></block></autolambda><list></list></block><block s="reportNewList"><list><l>5</l><l>1</l><l>3</l><l>7</l><l>9</l><l>2</l><l>4</l><l>6</l><l>8</l></list></block></block></block></script></block-definition><block-definition s="best empty square (2)" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doReport"><block s="reportFindFirst"><block s="reifyPredicate"><autolambda><block s="reportListContainsItem"><block var="board"/><l></l></block></autolambda><list></list></block><block s="reportNewList"><list><l>5</l><l>1</l><l>3</l><l>7</l><l>9</l><l>2</l><l>4</l><l>6</l><l>8</l></list></block></block></block></script></block-definition><block-definition s="winning triple for player" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doReport"><l></l></block></script></block-definition><block-definition s="can player win now" type="reporter" category="sensing"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doReport"><l></l></block></script></block-definition><block-definition s="winning square for player" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doReport"><l></l></block></script></block-definition><block-definition s="how many in triple" type="reporter" category="variables"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doReport"><l></l></block></script></block-definition><block-definition s="how many %&apos;letter&apos; in %&apos;triple&apos; ?" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs><input type="%s" initial="1"></input><input type="%s" initial="1"></input></inputs><script><block s="doReport"><block s="reportListAttribute"><l><option>length</option></l><block s="reportKeep"><block s="reifyPredicate"><autolambda><block s="reportVariadicEquals"><list><l></l><block var="letter"/></list></block></autolambda><list></list></block><block var="triple"/></block></block></block></script></block-definition><block-definition s="for %&apos;i&apos; = %&apos;start&apos; to %&apos;end&apos; %&apos;action&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%n">1</input><input type="%n">10</input><input type="%cs"></input></inputs><script><block s="doDeclareVariables"><list><l>step</l><l>tester</l></list></block><block s="doIfElse"><block s="reportVariadicGreaterThan"><list><block var="start"/><block var="end"/></list></block><script><block s="doSetVar"><l>step</l><l>-1</l></block><block s="doSetVar"><l>tester</l><block s="reifyReporter"><autolambda><block s="reportVariadicLessThan"><list><block var="i"/><block var="end"/></list></block></autolambda><list></list></block></block></script><script><block s="doSetVar"><l>step</l><l>1</l></block><block s="doSetVar"><l>tester</l><block s="reifyReporter"><autolambda><block s="reportVariadicGreaterThan"><list><block var="i"/><block var="end"/></list></block></autolambda><list></list></block></block></script></block><block s="doSetVar"><l>i</l><block var="start"/></block><block s="doUntil"><block s="evaluate"><block var="tester"/><list></list></block><script><block s="doRun"><block var="action"/><list></list></block><block s="doChangeVar"><l>i</l><block var="step"/></block></script></block></script></block-definition><block-definition s="can player %&apos;who&apos; win now?" type="predicate" category="sensing"><comment x="0" y="0" w="53.333333333333336" collapsed="true">5.6.4.2</comment><header></header><code></code><translations></translations><inputs><input type="%s"></input></inputs><script><block s="doReport"><block s="reportIsA"><custom-block s="winning square for player %s"><block var="who"/></custom-block><l><option>number</option></l></block></block></script><scripts><comment x="8.666666666666666" y="87.46666666666665" w="366.6666666666667" collapsed="false">This is a place where students are likely to use an unnecessary IF/ELSE block because the solution above seems &quot;too easy&quot; and therefore suspicious.  Ideally they should both understand that their solution is correct if it works -- there isn&apos;t only one &quot;right&quot; way to write a program -- and that composition of functions enables fairly complicated algorithms to be one-liners when actually coded.</comment></scripts></block-definition><block-definition s="winning square for player %&apos;who&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%s"></input></inputs><script><block s="doDeclareVariables"><list><l>triple</l></list></block><block s="doSetVar"><l>triple</l><custom-block s="winning triple for player %s"><block var="who"/></custom-block></block><block s="doIf"><block s="reportIsA"><block var="triple"/><l><option>list</option></l></block><script><block s="doReport"><block s="reportFindFirst"><block s="reifyPredicate"><autolambda><block s="reportIsA"><l></l><l><option>number</option></l></block></autolambda><list></list></block><block var="triple"/></block></block></script><list></list></block><block s="doReport"><l></l></block></script></block-definition><block-definition s="winning triple for player %&apos;who&apos;" type="reporter" category="lists"><comment x="0" y="0" w="53.333333333333336" collapsed="true">5.6.3.7</comment><header></header><code></code><translations></translations><inputs><input type="%s"></input></inputs><script><block s="doReport"><block s="reportFindFirst"><block s="reifyPredicate"><autolambda><block s="reportVariadicAnd"><list><block s="reportVariadicEquals"><list><custom-block s="how many %s in %l ?"><block var="who"/><l/></custom-block><l>2</l></list></block><block s="reportVariadicEquals"><list><custom-block s="how many %s in %l ?"><custom-block s="opponent %s"><block var="who"/></custom-block><l/></custom-block><l>0</l></list></block></list></block></autolambda><list></list></block><custom-block s="status of all winning triples"></custom-block></block></block></script></block-definition><block-definition s="how many %&apos;letter&apos; in %&apos;triple&apos; ?" type="reporter" category="lists"><comment x="0" y="0" w="53.333333333333336" collapsed="true">5.6.3.5</comment><header></header><code></code><translations></translations><inputs><input type="%s"></input><input type="%l"></input></inputs><script><block s="doReport"><block s="reportListAttribute"><l><option>length</option></l><block s="reportKeep"><block s="reifyPredicate"><autolambda><block s="reportVariadicEquals"><list><l></l><block var="letter"/></list></block></autolambda><list></list></block><block var="triple"/></block></block></block></script></block-definition><block-definition s="opponent %&apos;who&apos;" type="reporter" category="operators"><comment x="0" y="0" w="108" collapsed="true">helper for 5.6.3.7</comment><header></header><code></code><translations></translations><inputs><input type="%s"></input></inputs><script><block s="doReport"><block s="reportIfElse"><block s="reportVariadicEquals"><list><block var="who"/><l>X</l></list></block><l>O</l><l>X</l></block></block></script></block-definition><block-definition s="status of triple %&apos;triple&apos;" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs><input type="%l"></input></inputs><script><block s="doReport"><block s="reportMap"><block s="reifyReporter"><autolambda><block s="reportListItem"><l></l><block var="board"/></block></autolambda><list></list></block><block var="triple"/></block></block></script></block-definition><block-definition s="possible winning triples" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doReport"><block s="reportNewList"><list><block s="reportNewList"><list><l>1</l><l>2</l><l>3</l></list></block><block s="reportNewList"><list><l>4</l><l>5</l><l>6</l></list></block><block 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