<snapdata remixID="14180409"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 10.4.5, 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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