<snapdata remixID="12266294"><project name="U3L1-ShoppingList_Empty to Students-nigel" app="Snap! 8.1, https://snap.berkeley.edu" version="2"><notes></notes><thumbnail>data:image/png;base64,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select="1"><scene name="U3L1-ShoppingList_Empty to Students-nigel"><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" category="control"><header></header><code></code><translations></translations><inputs><input type="%boolUE"></input><input type="%cs"></input></inputs><script><block s="doDeclareVariables"><list><l>breakpoint</l></list></block><block s="doIf"><block s="evaluate"><block var="test"/><list></list></block><script><block s="doSetVar"><l>breakpoint</l><block var="test"/></block><block s="doShowVar"><l>breakpoint</l></block><block s="doRun"><block var="action"/><list></list></block><block s="doPauseAll"></block><block s="doHideVar"><l></l></block></script></block></script></block-definition><block-definition s="word $arrowRight list %&apos;word&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="word"/><l><option>letter</option></l></block></block></script></block></script></block-definition><block-definition s="ignore %&apos;x&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s"></input></inputs></block-definition><block-definition s="tell %&apos;sprite&apos; to %&apos;commands&apos;" type="command" category="sensing"><header></header><code></code><translations></translations><inputs><input type="%txt">Sprite</input><input type="%cs"></input></inputs><script><block s="doRun"><block s="reportAttributeOf"><block var="commands"/><block var="sprite"/></block><list></list></block></script></block-definition><block-definition s="ask for %&apos;reporter&apos; from %&apos;sprite&apos;" type="reporter" category="sensing"><header></header><code></code><translations></translations><inputs><input type="%repRing"></input><input type="%txt">Sprite</input></inputs><script><block s="doReport"><block s="evaluate"><block s="reportAttributeOf"><block var="reporter"/><block var="sprite"/></block><list></list></block></block></script></block-definition><block-definition s="tell %&apos;sprite&apos; %&apos;action&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">Sprite</input><input type="%cs"></input></inputs><script><block s="doRun"><block s="reportAttributeOf"><block var="action"/><block var="sprite"/></block><list></list></block></script></block-definition><block-definition s="ask %&apos;sprite&apos; %&apos;expression&apos;" type="reporter" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">Sprite</input><input type="%repRing"></input></inputs><script><block s="doReport"><block s="evaluate"><block s="reportAttributeOf"><block var="expression"/><block var="sprite"/></block><list></list></block></block></script></block-definition><block-definition 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