<snapdata remixID="12333481"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 8.2, 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="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></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="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></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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