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id="10"/></item><item><costume name="infected" center-x="13.5" center-y="10.5" 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id="11"/></item></list></costumes><sounds><list struct="atomic" id="12"></list></sounds><blocks></blocks><variables></variables><scripts><script x="10" y="10"><block s="receiveOnClone"></block><block s="doWaitUntil"><block s="reportEquals"><block var="all made"/><block s="reportBoolean"><l><bool>true</bool></l></block></block></block><block s="doUntil"><block s="reportEquals"><block s="getCostumeIdx"></block><l>2</l></block><script><block s="doIf"><custom-block s="touching infected"></custom-block><script><block s="doSwitchToCostume"><l>infected</l></block><block s="doChangeVar"><l>number infected</l><l>1</l></block></script></block></script></block></script><script x="40" y="191"><block s="receiveGo"></block><block s="doSetVar"><l>number infected</l><l>0</l></block><block s="doSetVar"><l>all made</l><block s="reportBoolean"><l><bool>false</bool></l></block></block><block s="show"></block><block s="gotoXY"><l>0</l><l>0</l></block><block s="setScale"><l>50</l></block><block s="doAsk"><l>size of population? (1-200)</l></block><block s="doUntil"><block s="reportAnd"><block s="reportLessThan"><l>0</l><block s="getLastAnswer"></block></block><block s="reportGreaterThan"><l>201</l><block s="getLastAnswer"></block></block></block><script><block s="doAsk"><l>size of population? (1-200)</l></block></script></block><block s="doSetVar"><l>population size</l><block s="getLastAnswer"></block></block><block s="doAsk"><l>% infected? (1-100)</l></block><block s="doUntil"><block s="reportAnd"><block s="reportLessThan"><l>0</l><block s="getLastAnswer"></block></block><block s="reportLessThan"><block s="getLastAnswer"></block><l>101</l></block></block><script><block s="doAsk"><l>% infected? (1-100)</l></block></script></block><block s="doSetVar"><l>number infected</l><block s="reportRound"><block s="reportSum"><block s="reportProduct"><block s="reportQuotient"><block s="getLastAnswer"></block><l>100</l></block><block var="population size"/></block><l>.4</l></block></block></block><block s="doAsk"><l>speed of spreading? (1-10)</l></block><block s="doUntil"><block s="reportAnd"><block s="reportLessThan"><l>0</l><block s="getLastAnswer"></block></block><block s="reportLessThan"><block s="getLastAnswer"></block><l>11</l></block></block><script><block s="doAsk"><l>speed of spreading? (1-10)</l></block></script></block><block s="doSetVar"><l>speed</l><block s="getLastAnswer"></block></block><block s="hide"></block><block s="gotoXY"><l>-100</l><l>-100</l></block><block s="doRepeat"><block var="population size"/><script><block s="createClone"><l><option>myself</option></l></block></script></block><block s="doSetVar"><l>all made</l><block s="reportBoolean"><l><bool>true</bool></l></block></block></script><script x="264" y="242"><block s="receiveGo"></block><block s="removeClone"></block></script><script x="451" y="83"><block s="receiveOnClone"></block><block s="doWarp"><script><block s="doGotoObject"><l><option>random position</option></l></block><block s="show"></block><block s="doIf"><block s="reportNot"><block s="reportEquals"><block var="number infected"/><l>0</l></block></block><script><block s="doChangeVar"><l>number infected</l><l>-1</l></block><block s="doSwitchToCostume"><l>infected</l></block></script></block></script></block><block s="doWaitUntil"><block s="reportEquals"><block var="all made"/><block s="reportBoolean"><l><bool>true</bool></l></block></block></block><block s="doResetTimer"></block><block s="doIf"><block s="reportEquals"><block s="getCostumeIdx"></block><l>2</l></block><script><block s="doChangeVar"><l>number infected</l><l>1</l></block></script></block><block s="doFaceTowards"><l><option>random position</option></l></block><block s="doUntil"><block s="reportEquals"><block var="population size"/><block var="number infected"/></block><script><block s="forward"><block var="speed"/></block><block s="bounceOffEdge"></block></script></block><block s="doSetVar"><l>time until infected</l><block s="getTimer"></block></block></script></scripts></sprite><watcher var="speed" style="normal" x="9.979166666666742" y="51.89167065833328" color="243,118,29" hidden="true"/><watcher var="percentage infected" style="normal" x="9.979166666666742" y="30.93541866249989" color="243,118,29" hidden="true"/><watcher var="population size" style="normal" x="9.979166666666742" y="9.979166666666636" color="243,118,29" hidden="true"/><watcher var="all made" style="normal" x="9.979166666666742" y="30.93541866249989" color="243,118,29" hidden="true"/><watcher var="number infected" style="normal" x="9.979166666666742" y="54.885420658333175" color="243,118,29" hidden="true"/><watcher var="time until infected" style="normal" x="6.9854166666666515" y="19.95833932083331" color="243,118,29"/></sprites></stage><hidden></hidden><headers></headers><code></code><blocks><block-definition s="touching infected" type="predicate" category="sensing"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doForEach"><l>item</l><block s="reportGet"><l><option>neighbors</option></l></block><script><block s="doIf"><block s="reportAnd"><block s="reportTouchingObject"><block var="item"/></block><block s="reportEquals"><block s="reportAttributeOf"><l><option>costume #</option></l><block var="item"/></block><l>2</l></block></block><script><block s="doReport"><block s="reportBoolean"><l><bool>true</bool></l></block></block></script></block></script></block><block s="doReport"><block s="reportBoolean"><l><bool>false</bool></l></block></block></script></block-definition><block-definition s="average time for disease to spread with population size" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doReport"><l></l></block></script></block-definition></blocks><variables><variable name="speed"><l>3</l></variable><variable name="percentage infected"><l>90</l></variable><variable name="population size"><l>46</l></variable><variable name="all made"><bool>false</bool></variable><variable name="number infected"><l>0</l></variable><variable name="time until infected"><l>0</l></variable></variables></project><media name="U5L2- Disease Sim" app="Snap! 5.4, http://snap.berkeley.edu" version="1"></media></snapdata>