<snapdata remixID="13145226"><project name="U3L1-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="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;" 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 %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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