<snapdata remixID="12259766"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 8.1, 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></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 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