<snapdata remixID="14911846"><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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</th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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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var="word"/><l><option>letter</option></l></block></block></script></block></script></block-definition><block-definition s="ignore %&apos;x&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s"></input></inputs></block-definition><block-definition s="tell %&apos;sprite&apos; to %&apos;commands&apos;" type="command" category="sensing"><header></header><code></code><translations></translations><inputs><input type="%txt">Sprite</input><input type="%cs"></input></inputs><script><block s="doRun"><block s="reportAttributeOf"><block var="commands"/><block var="sprite"/></block><list></list></block></script></block-definition><block-definition s="ask for %&apos;reporter&apos; from %&apos;sprite&apos;" type="reporter" category="sensing"><header></header><code></code><translations></translations><inputs><input type="%repRing"></input><input type="%txt">Sprite</input></inputs><script><block s="doReport"><block s="evaluate"><block s="reportAttributeOf"><block var="reporter"/><block var="sprite"/></block><list></list></block></block></script></block-definition><block-definition s="tell %&apos;sprite&apos; %&apos;action&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">Sprite</input><input type="%cs"></input></inputs><script><block s="doRun"><block s="reportAttributeOf"><block var="action"/><block var="sprite"/></block><list></list></block></script></block-definition><block-definition s="ask %&apos;sprite&apos; %&apos;expression&apos;" type="reporter" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">Sprite</input><input type="%repRing"></input></inputs><script><block s="doReport"><block s="evaluate"><block s="reportAttributeOf"><block var="expression"/><block var="sprite"/></block><list></list></block></block></script></block-definition><block-definition s="search" 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