<snapdata remixID="12012992"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 7, 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></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></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="reportEquals"><block var="data"/><block s="reportNewList"><list></list></block></block></block></script></block-definition><block-definition s="keep items such that %&apos;pred&apos; from %&apos;data&apos;" type="reporter" 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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></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="reportGreaterThan"><block var="start"/><block var="end"/></block><script><block s="doSetVar"><l>step</l><l>-1</l></block><block s="doSetVar"><l>tester</l><block s="reifyReporter"><autolambda><block s="reportLessThan"><block var="i"/><block var="end"/></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="reportGreaterThan"><block var="i"/><block var="end"/></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></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></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="same" 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