<snapdata remixID="14965140"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 11.0.8, 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 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 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