<snapdata remixID="15000919"><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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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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