<snapdata remixID="13144300"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 9.0, 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;" 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%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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