<snapdata remixID="13249032"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 9.0, https://snap.berkeley.edu" version="2"><notes></notes><thumbnail>data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAKAAAAB4CAYAAAB1ovlvAAAAAXNSR0IArs4c6QAADXpJREFUeF7tnQtUFdUax/9HUARBAoR1fSWoqAgGKiCi5ANMAZUMkcAyyFeIuizNq0GZyiO9dtGyAjFRrmL5QkLEDCuWXhDMBPFmpSkEGDe7oMhDReSuPa2zZUw8R6OZOWfvvZbreDx75vu+///nzJw538yoWlpaWsAHV0AmBVQcQJmU52EFBTiAHARZFXgggGfOnEFubi7I3lmlUkn2am1tDT8/P1hYWMgqCg8unQJ/APDYsWOwt7eXLoMHRCouLsaUKVNkzYEHl0YBEYCnT5+GlZWVEJmAOGHCBGELeOfOHeFPx44dpckKgK2trWSxeCD5FBABuGHDBgQGBlIAO3ToADc3N3h5eWHHjh0YPnw4mpqaJMnWzs5Okjg8iLwKiABcv349BZCkZWBgIGTXu3dvlJaWClsl8irF6NevnxRheAyZFRABuG7dOhGAcubWv39/OcPz2BIpIAIwPj6eAmjcyRDN7z4N444q3OxgjAtmLu2eklljFWxvXxbWa+bihwqPpTTGgAED2j0eX6HyFBABGBcXRwG8daMaffcGY7vFy5gSEi5kTo4JrSwt0dzcrLGS6poaYY76NI56gfvf19bWwm6nP5mIyvCjdL0DBw7UGINP0H0FRADGxMRQAJvqr+HmgShYz/2YVmnS0RDVEc4wUGkuvIOxKQzeycXdu3cpvG0t9eXebQiuTkX5S0foFAcHB81B+AydV0AE4Nq1azF9+nThxPOdhutIz8zG86EzkZOTA19fX9RerYJJ7GTtilapYJhwSliXekv4sAVttozDz7Oy6RZz8ODB2sXhs3RaARGAa9asoVvA5sZaHM7JFYDMyMhAQEAA6v73KwXQ0LoXTF0n4NqRVKClGUb9nHHrp+J7YqhUUG04iaioKJBjSwLiw35Z6f6xD8pePEyXd3R01GlhefLaKSACcPXq1RTAuzdvIOuLr4X35JxcWVmZCMB+aZfwW+oaWAW9htqv96Crzwu49NIgEYD4Rz49laPpuLHHtgkofSGLLu/k5KRdBXyWTisgAnDVqlX3TsPcrsdnR44JW0D1+LWiDH97L0Srgq0Xb8aV7s4gXzLIMDc3F3av5I96qLeI5H2v7RNxKTSTfvbUU09pFYdP0m0FRAC+9dZbFEBVUwMysnPoMeFf3ZTwZKovfgr5jKrp7Oys28ry7LVSQARgdHQ0BdCg+SbSs45KdmLadqc/LgQfpEkPHTpUqwL4JN1WQAQg+cKg/i3Y8O4t7M88ItoFt95lkrLb873drsn4cUY6VXPYsGG6rSzPXisFRACuXLmSAtgJTdibcViyLWD/TwLw/fT9NGlXV1etCuCTdFsBEYArVqygx3xGqjvYczBLMgDtP30W5wP30fOApAuHD/1XQATg8uXL6S63c4dmfHIgUzIAB+59Dv+Ztod+S3Z3d9d/9XmF4mtCXn/9dboFNDFsQdq+DMkAdNg/Heee/ZRuAT08PLg9DCgg2gIuW7aMAtelI7BzT7pkADqmz0BJwCdU8pEjRzIgPy9RBODSpUspcKadVPjXpwckA9DpYDDOTt1NHfH09OTuMKCACMBXX32VAte1swG2p+2VDEDnzFAUTd5FJR89ejQD8vMSRQAuWbKEAmdubIiUXXv+MgBDQ0NRXl6OtLQ0oeXf5dBMnPHfSR0h16Hwof8KiABcvHgxBc6iSydsTd0tfCmprKxEz5492/36YAIggY+c0B6ePQunfVOp4mPGjNF/9XmF4m/BixYtot+CLU2NkLwjDUZGRoiIiBAgqaio0EqyEydO4P5daGZm5gOv9VW3erkeeQnfTNpBvwWPHTtWq1h8km4rINoCRkZGUgC7dTVGUspOXLlyBQcPHgT5nXjcuHG02sLCQoSEhCA1NRXBwcHYtGkTvL29hd2qoaEhJk2aJLRwqUdeXh7u/2LRGkr3o+EofCaFAjh+/HjdVpZnr5UCIgAXLFhAAbQ2N8HxlDjkXDEEadMyMzPD5cuXKSB9+vTB7Nmz4ePjA3LKpKamBp9//jkmTpyI8+fPY9SoUaiurhYudL906RLI9SbJycl0+aysLPj7+4O8uvW1wtTKZBRM2EY/JzDzof8KiACMjY3FiBEjhKptnugiXJT05ajNOHnypAAV2RU/bLi4uKCoqEijatnZ2UKLv/rVLPsNDDG6inzvrfSXEAI2H/qvgAjAqqoqlJSUCFVbmnXGwPSZwt+X1kyER3dDtKAFKqja7fWX2lsIMihAd4Mb5Po55PtsFeJdu3YNQUFB+q8+r/CPt2dLTEwUWvDJcHNzhaWFpSQyXbh4UdhVE/jIHbLILp8P/VegzfsDynHj1Nbt+vovPa+QKMBvUMk5kFUBDqCs8vPgzANYV1eH2S/PxunCQkloILc38Q+YioSEBEniKT0I0wCGzQpD4pZEdO7cWXKfyn4ux9miIkyZyvadYJkFMDoqGjGxMZKD1zpgRWUlevXsKWsOcgdnFsD96RkInBYgt/5ISkrC/PnzZc9DrgSYBbChoREmJsZa6T592nPYl34ANdXV+OW/VzHYof1uHec10hPH8/O0ykMfJzELoCYzg4KCkZKyDUlJybh48QISEt5F2KxZeG35Cri73rtm+Z8b34ffpGfwyrx5+DBpC7766itUVpTjx/PnMchpCLye9sLECW3/rOjpPgJ5hQWa0tHbz5kF8Opvv8G6W7cHGtvYeBM//vA9ot6IhpOzM2433Yaj4xDMDJmBs+e++wOAry1ZhPc/SETRqQJ06NQJCxdEoKjkOxw+lAnbvn2xLj62TYDGjPZC7onjeguYpsKYBXDFyii88xAwNAnXXp9/sHkzIhcubK/V6dx6mAUwPz9faCOTcxQVl8DFeYicKcgem1kAifIxa2KwbPkyWc4Dbtz4HkJDn4eNjY3sEMiZANMAEuEbGxpwubQUTbdvS+aDtY0NevToIVk8JQdiHkAlm8NCbhxAFlxWcI0cQAWbw0JqHEAWXFZwjRxABZvDQmocQBZcVnCNHEAFm8NCaswDSK7CmzNnHuLi42BtbS2J5yRmYuIWhIe9iEGDWj3cR5LoygrCNIDbU7YjLDxMVkcOZWZi8hR2u6KZBvDGjTqYmZnKCuD3P1zAoIH2suYgZ3BmAbz/GSdymqCkXKTWgVkAr1+/Ljy/7v5BGkz37k5DfkE++tva4WLp70901zTI3AGDHXH48CHU1FyDhcUTokWKS87BeciDH8DYVi6aYurD5xzAh7ioBrC07GeEzAgWoEz+OAVzZ4cjJPQF7E67d0fX1qs5kXcSoz09RACr/+1B4TiA+vBf6RFraGu3R7aApwoLsCAyEuEzQ5GTmwufMWPg7euH2uvXMchhMLy9xyMsNES0dSSwkrE9bbfwWetBtqL2dn2RsitNAPP+wXfBj2ievky/8NMl2PfrK2s5dfX1MO3SRdYc5AzO7C6YiJ6+/wCmBT4np/5I3pKMufPmypqDnMGZBpAIX3K2BHv2HUBExHwYG2t3meafNYwc80VHv4mNCe+iWxsXRv3ZGLqyPPMA6opR+ponB1BfndWRujiAOmKUvqbJAdRXZ3WkLg6gjhilr2lyAPXVWR2piwOoI0bpa5rMAzjCzR0nCwvoA3KkMlp4QKPLUHxbrPnBPlLlJEccpgEcPnQYTp/5Vg7daUx3VzcUfnNK1hzkDM40gHIKz2P/rgCzACqpA0VJuUj9H4NZAB+lB480k678+wqh2VSbQfoHbfs8qc1UYc6j5KL1SnVkIrMA1tfVo4up9m1Q6n4/4ivp7yPvSa/gFznHhAbV1t3TBMD4d9Yh6aMPtMKgob4eJoy2ZDELoFZkSDSJ74IlElppYaKiVyE2ZrWsaX2UtBUR8+fImoOcwZnfAsp5WWR+wSmMHOEmp/+yx2YeQOLApo0bkZy0BTcbGyUxpKu5OWLj4uDr7ydJPCUH4QAq2R0GcuMAMmCykkvkACrZHQZy4wAyYLKSS+QAKtkdBnLjADJgspJL5AAC+OLoUby96m38WlUliVcWlpaYPXcO5r/yiiTxlByEaQDJT2DHT+Thaa9RsnhUcu47ODk6SN4MK0uxbQRlGsDNHyZh4QJ5n1a+MupNxMeuVRITkubCLIAsNwBISpiGYMwC2NDQABMTE41ePMpNKjWurI0JvB3rcZXT4eXaagKdHxEJV1dXrFu7Ruj7W702DqvefAPk38n9AU/l/VuoWt0TGLN+A56fEUiVIPNIH6C6f1B9f0EyL3r5Mrpsa+l4Q6oOg/S4qbe1C/b08ISFlRWysjKFVasBVN8ZVR2vra5nNYDkDqq9evVGRUU5vZMqWWZH6k4B6NaD5cMBZnfBjwsuX659FWAaQLdhw3Hq29Ptq+gjrk0Jl4Y+YsrtOp1pAImScgLgOnQYvpH5uuR2pekxVsY8gGrNyHGYlEOlUkkZTrGxOICKtYaNxDiAbPis2Co5gIq1ho3EOIBs+KzYKjmAirWGjcQ4gGz4rNgqOYCKtYaNxDiAbPis2Co5gIq1ho3EOIBs+KzYKjmAirWGjcQ4gGz4rNgqOYCKtYaNxDiAbPis2Co5gIq1ho3EOIBs+KzYKjmAirWGjcQ4gGz4rNgqOYCKtYaNxDiAbPis2Co5gIq1ho3E/g+35pHzkQoTMAAAAABJRU5ErkJggg==</thumbnail><scenes select="1"><scene name="U3L1-ShoppingList_Empty to Students"><notes></notes><hidden></hidden><headers></headers><code></code><blocks><block-definition s="map %&apos;function&apos; over %&apos;lists&apos;" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs><input type="%repRing"></input><input type="%mult%l"></input></inputs><script><block s="doWarp"><script><block s="doDeclareVariables"><list><l>mapone</l><l>mapmany</l></list></block><block s="doSetVar"><l>mapone</l><block s="reifyScript"><script><block s="doIf"><custom-block s="empty? %l"><block var="data"/></custom-block><script><block s="doReport"><block s="reportNewList"><list></list></block></block></script><list></list></block><block s="doReport"><block s="reportCONS"><block s="evaluate"><block var="function"/><list><block s="reportListItem"><l>1</l><block var="data"/></block></list></block><block s="evaluate"><block var="mapone"/><list><block s="reportCDR"><block var="data"/></block></list></block></block></block></script><list><l>data</l></list></block></block><block s="doSetVar"><l>mapmany</l><block s="reifyScript"><script><block s="doIf"><custom-block s="empty? %l"><block s="reportListItem"><l>1</l><block var="data lists"/></block></custom-block><script><block s="doReport"><block s="reportNewList"><list></list></block></block></script><list></list></block><block s="doReport"><block s="reportCONS"><block s="evaluate"><block var="function"/><custom-block s="map %repRing over %mult%l"><block s="reifyReporter"><autolambda><block s="reportListItem"><l>1</l><l/></block></autolambda><list></list></block><list><block var="data lists"/></list></custom-block></block><block s="evaluate"><block var="mapmany"/><list><custom-block s="map %repRing over %mult%l"><block s="reifyReporter"><autolambda><block s="reportCDR"><l/></block></autolambda><list></list></block><list><block var="data lists"/></list></custom-block></list></block></block></block></script><list><l>data lists</l></list></block></block><block s="doIfElse"><custom-block s="empty? %l"><block s="reportCDR"><block var="lists"/></block></custom-block><script><block s="doReport"><block s="evaluate"><block var="mapone"/><list><block s="reportListItem"><l>1</l><block var="lists"/></block></list></block></block></script><script><block s="doReport"><block s="evaluate"><block var="mapmany"/><list><block var="lists"/></list></block></block></script></block></script></block></script></block-definition><block-definition s="empty? %&apos;data&apos;" type="predicate" category="lists"><header></header><code></code><translations></translations><inputs><input type="%l"></input></inputs><script><block s="doReport"><block s="reportVariadicEquals"><list><block var="data"/><block s="reportNewList"><list></list></block></list></block></block></script></block-definition><block-definition s="keep items such that %&apos;pred&apos; from %&apos;data&apos;" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs><input type="%predRing"></input><input type="%l"></input></inputs><script><block s="doWarp"><script><block s="doIf"><custom-block s="empty? %l"><block var="data"/></custom-block><script><block s="doReport"><block s="reportNewList"><list></list></block></block></script><list></list></block><block s="doIfElse"><block s="evaluate"><block var="pred"/><list><block s="reportListItem"><l>1</l><block var="data"/></block></list></block><script><block s="doReport"><block s="reportCONS"><block s="reportListItem"><l>1</l><block var="data"/></block><custom-block s="keep items such that %predRing from %l"><block var="pred"/><block s="reportCDR"><block var="data"/></block></custom-block></block></block></script><script><block s="doReport"><custom-block s="keep items such that %predRing from %l"><block var="pred"/><block s="reportCDR"><block var="data"/></block></custom-block></block></script></block></script></block></script></block-definition><block-definition s="combine with %&apos;function&apos; items of %&apos;data&apos;" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs><input type="%repRing"></input><input type="%l"></input></inputs><script><block s="doWarp"><script><block s="doIf"><custom-block s="empty? %l"><block s="reportCDR"><block var="data"/></block></custom-block><script><block s="doReport"><block s="reportListItem"><l>1</l><block var="data"/></block></block></script><list></list></block><block s="doReport"><block s="evaluate"><block var="function"/><list><block s="reportListItem"><l>1</l><block var="data"/></block><custom-block s="combine with %repRing items of %l"><block var="function"/><block s="reportCDR"><block var="data"/></block></custom-block></list></block></block></script></block></script></block-definition><block-definition s="if %&apos;test&apos; then %&apos;true&apos; else %&apos;false&apos;" type="reporter" category="control"><header></header><code></code><translations></translations><inputs><input type="%b"></input><input type="%anyUE"></input><input type="%anyUE"></input></inputs><script><block s="doIfElse"><block var="test"/><script><block s="doReport"><block s="evaluate"><block var="true"/><list></list></block></block></script><script><block s="doReport"><block s="evaluate"><block var="false"/><list></list></block></block></script></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="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"><custom-block s="empty? %l"><block s="reportCDR"><block var="words"/></block></custom-block><script><block s="doReport"><block s="reportListItem"><l>1</l><block var="words"/></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></block-definition><block-definition s="list $arrowRight sentence %&apos;data&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%l"></input></inputs><script><block s="doWarp"><script><block s="doReport"><custom-block s="join words %mult%txt"><block var="data"/></custom-block></block></script></block></script></block-definition><block-definition s="sentence $arrowRight list %&apos;text&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%txt"></input></inputs><script><block s="doWarp"><script><block s="doReport"><block s="reportTextSplit"><block var="text"/><l><option>whitespace</option></l></block></block></script></block></script></block-definition><block-definition s="catch %&apos;tag&apos; %&apos;action&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%cs"></input></inputs><script><block s="doCallCC"><block s="reifyScript"><script><block s="doSetVar"><l>tag</l><block var="cont"/></block><block s="doRun"><block var="action"/><list></list></block></script><list><l>cont</l></list></block></block></script></block-definition><block-definition s="throw %&apos;cont&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">catchtag</input></inputs><script><block s="doRun"><block var="cont"/><list></list></block></script></block-definition><block-definition s="catch %&apos;tag&apos; %&apos;value&apos;" type="reporter" category="control"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%anyUE"></input></inputs><script><block s="doCallCC"><block s="reifyScript"><script><block s="doSetVar"><l>tag</l><block var="cont"/></block><block s="doReport"><block s="evaluate"><block var="value"/><list></list></block></block></script><list><l>cont</l></list></block></block></script></block-definition><block-definition s="throw %&apos;tag&apos; %&apos;value&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">catchtag</input><input type="%s"></input></inputs><script><block s="doRun"><block var="tag"/><list><block var="value"/></list></block></script></block-definition><block-definition s="for each %&apos;item&apos; of %&apos;data&apos; %&apos;action&apos;" type="command" category="lists"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%l"></input><input type="%cs"></input></inputs><script><block s="doUntil"><custom-block s="empty? %l"><block var="data"/></custom-block><script><block s="doSetVar"><l>item</l><block s="reportListItem"><l>1</l><block var="data"/></block></block><block s="doRun"><block var="action"/><list><block s="reportListItem"><l>1</l><block var="data"/></block></list></block><block s="doSetVar"><l>data</l><block s="reportCDR"><block var="data"/></block></block></script></block></script></block-definition><block-definition s="if %&apos;test&apos; do %&apos;action&apos; and pause all $pause-1-255-220-0" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%boolUE"></input><input type="%cs"></input></inputs><script><block s="doDeclareVariables"><list><l>breakpoint</l></list></block><block s="doIf"><block s="evaluate"><block var="test"/><list></list></block><script><block s="doSetVar"><l>breakpoint</l><block var="test"/></block><block s="doShowVar"><l>breakpoint</l></block><block s="doRun"><block var="action"/><list></list></block><block s="doPauseAll"></block><block s="doHideVar"><l></l></block></script><list></list></block></script></block-definition><block-definition s="word $arrowRight list %&apos;word&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%txt"></input></inputs><script><block s="doWarp"><script><block s="doReport"><block s="reportTextSplit"><block var="word"/><l><option>letter</option></l></block></block></script></block></script></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="tell %&apos;sprite&apos; to %&apos;commands&apos;" type="command" category="sensing"><header></header><code></code><translations></translations><inputs><input type="%txt">Sprite</input><input type="%cs"></input></inputs><script><block s="doRun"><block s="reportAttributeOf"><block var="commands"/><block var="sprite"/></block><list></list></block></script></block-definition><block-definition s="ask for %&apos;reporter&apos; from %&apos;sprite&apos;" type="reporter" category="sensing"><header></header><code></code><translations></translations><inputs><input type="%repRing"></input><input type="%txt">Sprite</input></inputs><script><block s="doReport"><block s="evaluate"><block s="reportAttributeOf"><block var="reporter"/><block var="sprite"/></block><list></list></block></block></script></block-definition><block-definition s="tell %&apos;sprite&apos; %&apos;action&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">Sprite</input><input type="%cs"></input></inputs><script><block s="doRun"><block s="reportAttributeOf"><block var="action"/><block var="sprite"/></block><list></list></block></script></block-definition><block-definition s="ask %&apos;sprite&apos; %&apos;expression&apos;" type="reporter" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">Sprite</input><input type="%repRing"></input></inputs><script><block s="doReport"><block s="evaluate"><block s="reportAttributeOf"><block var="expression"/><block var="sprite"/></block><list></list></block></block></script></block-definition><block-definition s="clicked" type="predicate" category="sensing"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doReport"><l></l></block></script></block-definition><block-definition s="Search %&apos;answer&apos;" type="command" category="variables"><header></header><code></code><translations></translations><inputs><input type="%s"></input></inputs><script><block s="doForEach"><l>item</l><block var="list"/><script><block s="doIf"><block s="reportVariadicEquals"><list><block var="item"/><block var="answer"/></list></block><script><block s="doSayFor"><block s="reportJoinWords"><list><block s="getLastAnswer"></block><l> is on the list</l></list></block><l>2</l></block><block s="doSetVar"><l>presense</l><block s="reportBoolean"><l><bool>true</bool></l></block><comment w="90" collapsed="false">my true or false variable</comment></block></script><list></list></block></script><comment w="90" collapsed="false">checks if item is on list</comment></block><block s="doIf"><block s="reportVariadicEquals"><list><block s="reportBoolean"><l><bool>false</bool></l></block><block var="presense"/></list><comment w="90" collapsed="false">tells us if item is on list</comment></block><script><block s="doSayFor"><block s="reportJoinWords"><list><block s="getLastAnswer"></block><l> is not on the list</l></list></block><l>2</l></block></script><list></list></block></script></block-definition></blocks><stage name="Stage" width="480" height="360" costume="0" color="255,255,255,1" tempo="60" threadsafe="false" penlog="false" volume="100" pan="0" lines="round" ternary="true" hyperops="true" codify="false" inheritance="false" sublistIDs="false" 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