<snapdata remixID="13312165"><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 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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