<snapdata remixID="14964848"><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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</thumbnail><scenes 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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