<snapdata remixID="12122087"><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" 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></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 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