<snapdata remixID="14980808"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 11.0.8, 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><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 %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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