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var="small"/></block><l>0</l></block></block></script></block-definition><block-definition s="even? %&apos;number&apos;" type="predicate" category="operators"><header></header><code></code><translations></translations><inputs><input type="%n"></input></inputs><script><block s="doReport"><custom-block s="is %n divisible by %n ?"><block var="number"/><l>2</l></custom-block></block></script></block-definition><block-definition s="integer? %&apos;number&apos;" type="predicate" category="operators"><header></header><code></code><translations></translations><inputs><input type="%n"></input></inputs><script><block s="doReport"><block s="reportEquals"><block var="number"/><block s="reportRound"><block var="number"/></block></block></block></script></block-definition><block-definition s="%&apos;a&apos; ≤ %&apos;b&apos;" type="predicate" category="operators"><header></header><code></code><translations></translations><inputs><input type="%s"></input><input type="%s"></input></inputs><script><block s="doReport"><block s="reportOr"><block s="reportLessThan"><block var="a"/><block var="b"/></block><block s="reportEquals"><block var="a"/><block var="b"/></block></block></block></script></block-definition><block-definition s="%&apos;a&apos; ≥ %&apos;b&apos;" type="predicate" category="operators"><header></header><code></code><translations></translations><inputs><input type="%s"></input><input type="%s"></input></inputs><script><block s="doReport"><block s="reportOr"><block s="reportGreaterThan"><block var="a"/><block var="b"/></block><block s="reportEquals"><block var="a"/><block var="b"/></block></block></block></script></block-definition><block-definition s="%&apos;a&apos; ≠ %&apos;b&apos;" type="predicate" category="operators"><header></header><code></code><translations></translations><inputs><input type="%s"></input><input type="%s"></input></inputs><script><block s="doReport"><block s="reportNot"><block s="reportEquals"><block var="a"/><block var="b"/></block></block></block></script></block-definition><block-definition s="is %&apos;mid&apos; between %&apos;low&apos; and %&apos;high&apos; ?" type="predicate" category="operators"><header></header><code></code><translations></translations><inputs><input type="%s"></input><input type="%s"></input><input type="%s"></input></inputs><script><block s="doReport"><block s="reportAnd"><custom-block s="%s ≥ %s"><block var="mid"/><block var="low"/></custom-block><custom-block s="%s ≤ %s"><block var="mid"/><block var="high"/></custom-block></block></block></script><scripts><comment x="14.666666666666666" y="88.8" w="304.6666666666667" collapsed="false">As the lab says, it&apos;s okay to use &quot;&gt;&quot; and &quot;&lt;&quot; instead of &quot;≥&quot; and &quot;≤.&quot;</comment></scripts></block-definition><block-definition s="odd? %&apos;number&apos;" type="predicate" category="operators"><header></header><code></code><translations></translations><inputs><input type="%n"></input></inputs><script><block s="doReport"><block s="reportNot"><custom-block s="is %n divisible by %n ?"><block var="number"/><l>2</l></custom-block></block></block></script></block-definition><block-definition s="divisors of %&apos;number&apos;" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs><input type="%n"></input></inputs><script><block s="doReport"><block s="reportKeep"><block s="reifyPredicate"><autolambda><custom-block s="is %n divisible by %n ?"><block var="number"/><l></l></custom-block></autolambda><list></list></block><block s="reportNumbers"><l>1</l><block var="number"/></block></block></block></script></block-definition><block-definition s="number of divisors %&apos;number&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%n"></input></inputs><script><block s="doReport"><block s="reportListAttribute"><l><option>length</option></l><custom-block s="divisors of %n"><block var="number"/></custom-block></block></block></script></block-definition><block-definition s="maximum of %&apos;a&apos; and %&apos;b&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%n"></input><input type="%n"></input></inputs><script><block s="doReport"><block s="reportIfElse"><block s="reportGreaterThan"><block var="a"/><block var="b"/></block><block var="a"/><block var="b"/></block></block></script><scripts><comment x="16" y="87.46666666666665" w="246.66666666666666" collapsed="false">The &quot;reporter IF&quot; used here is the simplest and most elegant solution, and you should show it to students when you debrief this lab, but you&apos;re more likely to get commands, e.g. this:</comment><script x="23" y="172.46666666666667"><block s="doIfElse"><block s="reportGreaterThan"><block var="a"/><block var="b"/></block><script><block s="doReport"><block var="a"/></block></script><script><block s="doReport"><block var="b"/></block></script></block></script></scripts></block-definition><block-definition s="minimum of %&apos;a&apos; and %&apos;b&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%n"></input><input type="%n"></input></inputs><script><block s="doReport"><block s="reportIfElse"><block s="reportLessThan"><block var="a"/><block var="b"/></block><block var="a"/><block var="b"/></block></block></script></block-definition><block-definition s="maximum of list %&apos;data&apos;" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs><input type="%l"></input></inputs><script><block s="doReport"><block s="reportCombine"><block var="data"/><block s="reifyReporter"><autolambda><custom-block s="maximum of %n and %n"><l></l><l></l></custom-block></autolambda><list></list></block></block></block></script></block-definition><block-definition s="minimum of list %&apos;data&apos;" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs><input type="%l"></input></inputs><script><block s="doReport"><block s="reportCombine"><block var="data"/><block s="reifyReporter"><autolambda><custom-block s="minimum of %n and %n"><l></l><l></l></custom-block></autolambda><list></list></block></block></block></script></block-definition><block-definition s="sum of list %&apos;data&apos;" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs><input type="%l"></input></inputs><script><block s="doReport"><block s="reportCombine"><block var="data"/><block s="reifyReporter"><autolambda><block s="reportSum"><l></l><l></l></block></autolambda><list></list></block></block></block></script></block-definition><block-definition s="average of list %&apos;data&apos;" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs><input type="%l"></input></inputs><script><block s="doReport"><block s="reportQuotient"><custom-block s="sum of list %l"><block var="data"/></custom-block><block s="reportListAttribute"><l><option>length</option></l><block var="data"/></block></block></block></script><scripts><comment x="14" y="88.8" w="289.3333333333333" collapsed="false">Important note:  It does NOT work to make a block that takes the average of two numbers and then do</comment><script x="19" y="151.13333333333333"><block s="doReport"><block s="reportCombine"><block var="data"/><block s="reifyReporter"><autolambda><custom-block s="average of %n and %n"><l></l><l></l></custom-block></autolambda><list></list></block></block></block></script><script x="15" y="273.8"><block s="reportCombine"><block s="reportNewList"><list><l>5</l><l>100</l><l>200</l></list></block><block s="reifyReporter"><autolambda><custom-block s="average of %n and %n"><l></l><l></l></custom-block></autolambda><list></list></block></block></script><script x="15.333333333333334" y="306.46666666666664"><block s="reportCombine"><block s="reportNewList"><list><l>200</l><l>100</l><l>5</l></list></block><block s="reifyReporter"><autolambda><custom-block s="average of %n and %n"><l></l><l></l></custom-block></autolambda><list></list></block></block></script><comment x="18.333333333333332" y="190.80000399999997" w="303.3333333333333" collapsed="false">This will tempt students because it follows the pattern of the other exercises so far on this page.  But COMBINE can be used only with associative operators, which AVERAGE isn&apos;t.  The last number to be averaged in will have too much influence.  Try these:</comment></scripts></block-definition><block-definition s="average of %&apos;a&apos; and %&apos;b&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%n"></input><input type="%n"></input></inputs><script><block s="doReport"><block s="reportQuotient"><block s="reportSum"><block var="a"/><block var="b"/></block><l>2</l></block></block></script></block-definition><block-definition s="intersection %&apos;lista&apos; %&apos;listb&apos;" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs><input type="%l"></input><input type="%l"></input></inputs><script><block s="doReport"><block s="reportKeep"><block s="reifyPredicate"><autolambda><block s="reportListContainsItem"><block var="listb"/><l></l></block></autolambda><list></list></block><block var="lista"/></block></block></script><scripts><comment x="10.666666666666666" y="92.8" w="314.6666666666667" collapsed="false">This solution is a little counterintuitive, because it treats the two lists asymmetrically.  We start with LISTA and keep items from it that are also in LISTB.  So, expect students to have trouble thinking of this solution.</comment></scripts></block-definition><block-definition s="make a point" type="command" category="looks"><header></header><code></code><translations></translations><inputs></inputs><script><block s="setSize"><l>5</l></block><block s="down"></block><block s="forward"><l>0</l></block><block s="up"></block></script></block-definition></blocks><variables></variables></project><media name="U2L4-MathLibrary" app="Snap! 6, https://snap.berkeley.edu" version="1"></media></snapdata>