<snapdata remixID="13146772"><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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