<snapdata remixID="15054635"><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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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 %&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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