<snapdata remixID="14981420"><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 type="%s"></input></inputs><script><block s="doRun"><block var="tag"/><list><block var="value"/></list></block></script></block-definition><block-definition s="for each %&apos;item&apos; of %&apos;data&apos; %&apos;action&apos;" type="command" category="lists"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%l"></input><input type="%cs"></input></inputs><script><block s="doUntil"><custom-block s="empty? %l"><block var="data"/></custom-block><script><block s="doSetVar"><l>item</l><block s="reportListItem"><l>1</l><block var="data"/></block></block><block s="doRun"><block var="action"/><list><block s="reportListItem"><l>1</l><block var="data"/></block></list></block><block s="doSetVar"><l>data</l><block s="reportCDR"><block var="data"/></block></block></script></block></script></block-definition><block-definition s="if %&apos;test&apos; do %&apos;action&apos; and pause all $pause-1-255-220-0" type="command" 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