<snapdata remixID="14181662"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 10.4.5, 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" category="control"><header></header><code></code><translations></translations><inputs><input type="%boolUE"></input><input type="%cs"></input></inputs><script><block s="doDeclareVariables"><list><l>breakpoint</l></list></block><block s="doIf"><block s="evaluate"><block var="test"/><list></list></block><script><block s="doSetVar"><l>breakpoint</l><block var="test"/></block><block s="doShowVar"><l>breakpoint</l></block><block s="doRun"><block var="action"/><list></list></block><block s="doPauseAll"></block><block s="doHideVar"><l></l></block></script><list></list></block></script></block-definition><block-definition s="word $arrowRight list %&apos;word&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="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="delete 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