<snapdata remixID="12267022"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 8.1, 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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