<snapdata remixID="13392837"><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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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" 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