<snapdata remixID="12230906"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 7, https://snap.berkeley.edu" version="2"><notes></notes><thumbnail>data:image/png;base64,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</thumbnail><scenes 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></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></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="reportEquals"><block var="data"/><block s="reportNewList"><list></list></block></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></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></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="reportGreaterThan"><block var="start"/><block var="end"/></block><script><block s="doSetVar"><l>step</l><l>-1</l></block><block s="doSetVar"><l>tester</l><block s="reifyReporter"><autolambda><block s="reportLessThan"><block var="i"/><block var="end"/></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="reportGreaterThan"><block var="i"/><block var="end"/></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" 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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 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