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struct="atomic" id="2"></list></costumes><sounds><list struct="atomic" id="3"></list></sounds><variables></variables><blocks></blocks><scripts></scripts><sprites><sprite name="Square" idx="1" x="-50" y="-100" heading="90" scale="1" volume="100" pan="0" rotation="1" draggable="false" hidden="true" costume="1" color="80,80,80,1" pen="tip" id="8"><costumes><list id="9"><item><costume name="Empty" center-x="29" center-y="28" image="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADkAAAA5CAYAAACMGIOFAAAAAXNSR0IArs4c6QAAAShJREFUaEPtmyEOg0AQRT836A1ag24TBIakFWv2Fr0BFgc4LKdZs6ICgyCpx9AbcIRmG0LS0lbPbj4nmDf/v4xZIgAVgCOAE8L87tECeQZwCZMRt0/ISWuNNE0PPgP3fT8ZYxyC43iH1FpPbdsijmOvIcdxnPI8hzFmC1lVFcqy9DnEdfa6ruF4NkkS0rN8mSSd9KiyrCvryrrK2gCdpJOyGvl3GtaVdWVdZW2ATtJJWY3kCaGTdJJOytoAnaSTshrJO0kn6SSdlLUBOkknZTWSd5JO0kk6KWsDdJJOymok7ySdpJMhOKmUmpumQZIkO494NqMOwzAXRQFrrePYPM+elVLIssxryK7rZmutg/8K6XOAv2Z/JXldHqTvQyQE8HCQof4qsWb2BLkbqAIXp3YbAAAAAElFTkSuQmCC" id="10"/></item><item><costume name="X" center-x="29" center-y="29" image="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADkAAAA6CAYAAAAKjPErAAAAAXNSR0IArs4c6QAAA8NJREFUaEPd271P20AYBvCHVkIMlmDokA2GbgwJeyFBXegE/AWEjSEDqEu2wMYIAwsMwMYGY5cKBsaqAkG2DrBlqCqQGBBSpepxOcs57LN9H3ack1hiB/t373vvmTszguFsEwAeBG0EwCaAKoDakHjfAagAeAHwB8BPgawDaAwJUmZcyMgXz/PQarVGx8bGSmV+fn7G0dERer1eItI/oVar4fz8HBMTTO1ytOXlZZydnQU3Oz09/bvb7X4A8CaSwUllgq6urvpRFO3w8BD39/fY3GS5kZBLS0t9vVEGqAzsdDo+bmtrKxrJg5OTk+AXRRtkqAxcWVkJIqpEsicY+kGHqoAMUCKSJ0VBmeuMbNEtCZgaGQVltWXVLRKaBpgJ6ZemiwuwID0+PvoBLBIqZ1d4DMrZlSpdw1+6urpCo9EoFJoFmDmSAlskVAbW63U/w1QtcySLhMrAarXqA5OexrSRxOYZUV2gdrrmPUZNgFaQriNqCrSGdAXlcJifn8fDw/8/7NOOQeMpRFXFbI5RW0CrkbRZdWXg+Pi4X+Smpqa0niKNqmvcFU0iGgXkNGHy+OgEGTdG+VDPx0JV54THICNoCnSSrqrphccIbTabb5wuIigu4iyS4gJ3d3d+9K6vrwOYDOU5MzMzQRW1FcHckLwQpwA+1EdBeYwpykiy2QY6T9dwTkZB9/b2cHBw4BSYKzIuouGOOD09VRYmrfkj7fKH7i+P+h4jOjs7i9vb277DcQXJxrWdFx75Jomcm5vDzc3NcCLlIiN3gKto5hpJThOiihLIwrO/v6+cXkqVrlHL93woUE0vNoC5Vdc4oEC4hjpP17Rroy6hTpFpgaqIck+G2xUmzRkyK1AF5dhl5dVtTpC6wDB0fX0dx8fHgcsEah0p9gPF3amW75MiQ5gNqFVk1uX7JCSP24BaQ7oAik4whVpB2lgbTYqqCdQYmQfQNKJGyDyBJlBtZBFAXagWksuEXJcRTXf5Pmkcqo5nGaOZkTaX702QWaaXTEgZyPd8+FnSJqgpxjSiqZEuF39NO0FOXa7z8llXdH4q5CAD44pR+O2xRGQZgAK6s7ODjY2NIDEEdHd3N/7dusXFxb5NUBer26apKn8/6u2xhYUFbG9v89T+V0Hb7TZOTk7AfQq2MgAFWIZWKhXxgm8/0vO8v09PT+/LBoyDvn5+KV7P/gzgUzgN1tbWwN4oW2M9Cb/BzL0ngfwKwCsbKOX9/iCSu6PcCv4CYBTAJYBfKX/BIJ/28fXmvhMp/lWCH/Ln2yDfuc69/QO8JTdw9aXwqAAAAABJRU5ErkJggg==" id="11"/></item><item><costume name="O" center-x="28" center-y="28" image="data:image/png;base64,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" id="12"/></item></list></costumes><sounds><list struct="atomic" id="13"></list></sounds><blocks></blocks><variables><variable name="position number"><l>9</l></variable></variables><scripts><script x="10" y="10"><block s="receiveInteraction"><l><option>clicked</option></l></block></script><script x="10" y="56.66666666666666"><block s="createClone"><l><option>myself</option></l><comment w="180" collapsed="false">Demo script removed from hat block&#xD;for solution, replaced by script below.&#xD;Click the &quot;draggable&quot; box if you want&#xD;to demo this.</comment></block><block s="bubble"><l>I&apos;m the parent.</l></block><block s="doGlide"><l>1</l><block s="reportRandom"><l>-200</l><l>200</l></block><block s="reportRandom"><l>-150</l><l>150</l></block></block><block s="bubble"><l></l></block></script><script x="10" y="176.33333333333323"><block s="receiveGo"><comment w="53.333333333333336" collapsed="true">3.1.5.5</comment></block><block s="doSetVar"><l>board</l><block s="reportNewList"><list><l>1</l><l>2</l><l>3</l><l>4</l><l>5</l><l>6</l><l>7</l><l>8</l><l>9</l></list></block></block><custom-block s="makeBoard"><comment w="129.33333333333334" collapsed="true">3.1.5.6  Look inside. </comment></custom-block><block s="doSetVar"><l>X&apos;s turn?</l><block s="reportBoolean"><l><bool>true</bool></l><comment w="90" collapsed="true">X plays first.</comment></block></block></script><script x="27" y="299.6666666666665"><block s="receiveInteraction"><l><option>clicked</option></l><comment w="53.333333333333336" collapsed="true">3.1.5.7</comment></block><block s="doSetVar"><l>turns</l><block s="reportSum"><block var="turns"/><l>1</l></block></block><block s="doIf"><block s="reportEquals"><block s="getCostumeIdx"></block><l>1</l><comment w="124" collapsed="true">If square is empty...</comment></block><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="doIf"><custom-block s="won? %s"><l>X</l></custom-block><script><block s="doTellTo"><l>Square</l><block s="reifyScript"><script><block s="doSayFor"><l>Player X wins!</l><l>2</l></block></script><list></list></block><list></list></block><block s="doStopThis"><l><option>this script</option></l></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="doTellTo"><l>Square</l><block s="reifyScript"><script><block s="doSayFor"><l>Player O wins!</l><l>2</l></block></script><list></list></block><list></list></block><block s="doStopThis"><l><option>this script</option></l></block></script></block></script></block><block s="doSetVar"><l>X&apos;s turn?</l><block s="reportNot"><block var="X&apos;s turn?"/></block><comment w="171.33333333333334" collapsed="false">Alternate between TRUE (x&apos;s turn) and FALSE (o&apos;s turn)</comment></block></script></block><block s="doIf"><block s="reportEquals"><block var="turns"/><l>9</l></block><script><block s="doTellTo"><l>Square</l><block s="reifyScript"><script><block s="doSayFor"><l>It&apos;s a tie!</l><l>2</l></block></script><list></list></block><list></list></block><block s="doStopThis"><l><option>this script</option></l></block></script></block></script><script x="485.66666666666663" y="228.16666666666637"><custom-block s="status of triple %l"><l/></custom-block></script><script x="353.66666666666663" y="286.3333333333329"><custom-block s="status of triple %l"><custom-block s="possible winning triples"></custom-block></custom-block></script><script x="444.69921875" y="340.5000000000002"><custom-block s="possible winning triples"></custom-block></script><script x="446.69921875" y="397.50000000000045"><custom-block s="status of all winning triples"></custom-block></script></scripts></sprite><watcher var="board" style="normal" x="8.3125" y="8.3125" color="243,118,29" extX="80" extY="70"/><watcher scope="Square" var="position number" style="normal" x="8.3125" y="85.6187516625" color="243,118,29" hidden="true"/><watcher scope="Square" s="getCostumeIdx" style="normal" x="8.3125" y="103.07500332500007" color="143,86,227" hidden="true"/><watcher var="turns" style="normal" x="10" y="10" color="243,118,29" hidden="true"/></sprites></stage><hidden></hidden><headers></headers><code></code><blocks><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="reportGreaterThan"><block var="start"/><block var="end"/></block><script><block s="doSetVar"><l>step</l><l>-1</l></block><block s="doSetVar"><l>tester</l><block s="reifyReporter"><autolambda><block s="reportLessThan"><block var="i"/><block var="end"/></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="reportGreaterThan"><block var="i"/><block var="end"/></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="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="errorObsolete"></block><script><block s="doReport"><block s="reportListItem"><l>1</l><block var="words"/></block></block></script></block><block s="doIf"><block s="reportEquals"><l></l><block s="reportListItem"><l>1</l><block var="words"/></block></block><script><block s="doReport"><custom-block s="join words %mult%txt"><block s="reportCDR"><block var="words"/></block></custom-block></block></script></block><block s="doIf"><block s="reportEquals"><l></l><block s="reportListItem"><l>2</l><block var="words"/></block></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></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="makeBoard" type="command" category="other"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doSwitchToCostume"><l>Empty</l><comment w="144.66666666666666" collapsed="true">Another possible solution.</comment></block><block s="show"></block><block s="doSetVar"><l>position number</l><l>0</l></block><block s="gotoXY"><l>-50</l><l>50</l></block><custom-block s="for %upvar = %n to %n %cs"><l>row</l><l>1</l><l>3</l><script><custom-block s="for %upvar = %n to %n %cs"><l>column</l><l>1</l><l>3</l><script><block s="doChangeVar"><l>position number</l><l>1</l></block><block s="createClone"><l><option>myself</option></l></block><block s="changeXPosition"><l>50</l></block></script></custom-block><block s="setXPosition"><l>-50</l></block><block s="changeYPosition"><l>-50</l></block></script></custom-block><block s="hide"></block></script><scripts><script x="325" y="352.1333333333334"><block s="doSwitchToCostume"><l>Empty</l></block><block s="show"></block></script><script x="267" y="190.63333333333333"><custom-block s="for %upvar = %n to %n %cs"><l>row</l><l>1</l><l>3</l><script><custom-block s="for %upvar = %n to %n %cs"><l>column</l><l>1</l><l>3</l><script><block s="gotoXY"><block s="reportSum"><l>-100</l><block s="reportProduct"><l>50</l><block var="column"/></block></block><block s="reportDifference"><l>100</l><block s="reportProduct"><l>50</l><block var="row"/></block></block></block><block s="createClone"><l><option>myself</option></l></block></script></custom-block></script><comment w="128" collapsed="false">The nested FOR loops are the important part of this solution.  Details like the starting position of the sprite might be different in student solutions.</comment></custom-block><block s="hide"></block></script></scripts></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>3</l><l>5</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>1</l><l>2</l><l>3</l></list></block><block s="reportNewList"><list><l>1</l><l>4</l><l>7</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>5</l><l>9</l></list></block><block s="reportNewList"><list><l>3</l><l>6</l><l>9</l></list></block></list></block></block></script></block-definition><block-definition s="status of triple %&apos;winning triple&apos;" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs><input type="%l"></input></inputs><script><block s="doReport"><l></l></block></script><scripts><script x="43.228515625" y="148.36666666666628"><block s="reportListItem"><l>1</l><block s="reportMap"><block s="reifyReporter"><autolambda><block s="reportListItem"><l></l><block var="board"/></block></autolambda><list></list></block><custom-block s="possible winning triples"></custom-block></block></block></script></scripts></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><block s="reportListItem"><l></l><block var="board"/></block></autolambda><list></list></block><custom-block s="possible winning triples"></custom-block></block></block></script></block-definition><block-definition s="won? %&apos;X or O&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="X or O"/><block var="X or O"/><block var="X or O"/></list></block></block></block></script></block-definition></blocks><variables><variable name="X&apos;s turn?"><bool>true</bool></variable><variable name="board"><list struct="atomic" id="493">1,2,3,4,5,6,7,8,9</list></variable><variable name="turns"><l>0</l></variable></variables></project><media name="U3L3-TicTacToe" app="Snap! 6, https://snap.berkeley.edu" version="1"></media></snapdata>