<snapdata remixID="11984008"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 7, https://snap.berkeley.edu" version="2"><notes></notes><thumbnail>data:image/png;base64,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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></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 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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="reportEquals"><block var="data"/><block s="reportNewList"><list></list></block></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></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></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="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"><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></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></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="addToCart?" type="command" category="variables"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doDeclareVariables"><list><l>tempVar</l></list></block><block s="doSetVar"><l>tempVar</l><block s="getLastAnswer"></block></block><block s="doAsk"><block s="reportJoinWords"><list><block s="getLastAnswer"></block><l> is not in your cart. 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