<snapdata remixID="13145361"><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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</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="AddItem" 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