<snapdata remixID="12242663"><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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