<snapdata remixID="14980886"><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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