<snapdata remixID="14895216"><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 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