<snapdata remixID="14121419"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 10.3.6, 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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