<snapdata remixID="14869258"><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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