<snapdata remixID="11203545"><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 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