<snapdata remixID="12976801"><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;" 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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