<snapdata remixID="12248900"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 7, 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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