<snapdata remixID="13416499"><project name="U4D12-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="U4D12-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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%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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