<snapdata remixID="15083189"><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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