<snapdata remixID="14284123"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 10.5.1, 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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