<snapdata remixID="13144330"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 9.0, https://snap.berkeley.edu" version="2"><notes></notes><thumbnail>data:image/png;base64,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</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 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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;" 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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 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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="Clear List 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