<snapdata remixID="14980293"><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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