<snapdata remixID="12384095"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 8.2, 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></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></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></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></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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var="data"/></custom-block></block></script></block></script></block-definition><block-definition s="sentence $arrowRight list %&apos;text&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%txt"></input></inputs><script><block s="doWarp"><script><block s="doReport"><block s="reportTextSplit"><block var="text"/><l><option>whitespace</option></l></block></block></script></block></script></block-definition><block-definition s="catch %&apos;tag&apos; %&apos;action&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%cs"></input></inputs><script><block s="doCallCC"><block s="reifyScript"><script><block s="doSetVar"><l>tag</l><block var="cont"/></block><block s="doRun"><block var="action"/><list></list></block></script><list><l>cont</l></list></block></block></script></block-definition><block-definition s="throw 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