<snapdata remixID="13248670"><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 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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