<snapdata remixID="15052806"><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;" 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