<snapdata remixID="15014535"><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;" 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 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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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