<snapdata remixID="11217678"><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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</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></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" 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></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></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="DeleteItem" type="command" category="variables"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doSetVar"><l>index</l><l>1</l></block><block s="doAsk"><l>What do you want to delete?</l></block><block s="doRepeat"><block s="reportListAttribute"><l><option>length</option></l><block var="list"/></block><script><block s="doIfElse"><block s="reportEquals"><block s="reportListItem"><block var="index"/><block var="list"/></block><block s="getLastAnswer"></block></block><script><block s="doDeleteFromList"><block var="index"/><block var="list"/></block></script><script><block s="doChangeVar"><l>index</l><l>1</l></block></script></block></script></block></script></block-definition><block-definition s="Search" type="command" category="variables"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doSetVar"><l>index</l><l>1</l></block><block s="doAsk"><l>What are you looking for?</l></block><block 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