<snapdata remixID="13092391"><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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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 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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 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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;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%mult%txt"></input></inputs><script><block s="doWarp"><script><block s="doIf"><custom-block s="empty? %l"><block s="reportCDR"><block var="words"/></block></custom-block><script><block s="doReport"><block s="reportListItem"><l>1</l><block var="words"/></block></block></script><list></list></block><block s="doReport"><block s="reportJoinWords"><list><block s="reportListItem"><l>1</l><block var="words"/></block><l> </l><custom-block s="join words %mult%txt"><block s="reportCDR"><block var="words"/></block></custom-block></list></block></block></script></block></script></block-definition><block-definition s="list $arrowRight sentence %&apos;data&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%l"></input></inputs><script><block s="doWarp"><script><block s="doReport"><custom-block s="join words %mult%txt"><block 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 %&apos;cont&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">catchtag</input></inputs><script><block s="doRun"><block var="cont"/><list></list></block></script></block-definition><block-definition s="catch %&apos;tag&apos; %&apos;value&apos;" type="reporter" category="control"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%anyUE"></input></inputs><script><block s="doCallCC"><block s="reifyScript"><script><block s="doSetVar"><l>tag</l><block var="cont"/></block><block s="doReport"><block s="evaluate"><block var="value"/><list></list></block></block></script><list><l>cont</l></list></block></block></script></block-definition><block-definition s="throw %&apos;tag&apos; %&apos;value&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">catchtag</input><input 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