<snapdata remixID="12169535"><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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