<snapdata remixID="14911238"><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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