<snapdata remixID="13311524"><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 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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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var="word"/><l><option>letter</option></l></block></block></script></block></script></block-definition><block-definition s="ignore %&apos;x&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s"></input></inputs></block-definition><block-definition s="tell %&apos;sprite&apos; to %&apos;commands&apos;" type="command" category="sensing"><header></header><code></code><translations></translations><inputs><input type="%txt">Sprite</input><input type="%cs"></input></inputs><script><block s="doRun"><block s="reportAttributeOf"><block var="commands"/><block var="sprite"/></block><list></list></block></script></block-definition><block-definition s="ask for %&apos;reporter&apos; from %&apos;sprite&apos;" type="reporter" category="sensing"><header></header><code></code><translations></translations><inputs><input type="%repRing"></input><input type="%txt">Sprite</input></inputs><script><block s="doReport"><block s="evaluate"><block s="reportAttributeOf"><block var="reporter"/><block var="sprite"/></block><list></list></block></block></script></block-definition><block-definition s="tell %&apos;sprite&apos; %&apos;action&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">Sprite</input><input type="%cs"></input></inputs><script><block s="doRun"><block s="reportAttributeOf"><block var="action"/><block var="sprite"/></block><list></list></block></script></block-definition><block-definition s="ask %&apos;sprite&apos; %&apos;expression&apos;" type="reporter" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">Sprite</input><input type="%repRing"></input></inputs><script><block s="doReport"><block s="evaluate"><block s="reportAttributeOf"><block var="expression"/><block var="sprite"/></block><list></list></block></block></script></block-definition><block-definition s="addItem" 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