<snapdata remixID="14911206"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 11.0.8, 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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