<snapdata remixID="14980934"><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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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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