<snapdata remixID="12213523"><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 type="%s"></input></inputs><script><block s="doRun"><block var="tag"/><list><block var="value"/></list></block></script></block-definition><block-definition s="for each %&apos;item&apos; of %&apos;data&apos; %&apos;action&apos;" type="command" category="lists"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%l"></input><input type="%cs"></input></inputs><script><block s="doUntil"><custom-block s="empty? %l"><block var="data"/></custom-block><script><block s="doSetVar"><l>item</l><block s="reportListItem"><l>1</l><block var="data"/></block></block><block s="doRun"><block var="action"/><list><block s="reportListItem"><l>1</l><block var="data"/></block></list></block><block s="doSetVar"><l>data</l><block s="reportCDR"><block var="data"/></block></block></script></block></script></block-definition><block-definition s="if %&apos;test&apos; do %&apos;action&apos; and pause all $pause-1-255-220-0" type="command" 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