<snapdata remixID="15083198"><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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