<snapdata remixID="12267137"><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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</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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