<snapdata remixID="11244627"><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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</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="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 %&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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