<snapdata remixID="14895286"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 11.0.8, https://snap.berkeley.edu" version="2"><notes></notes><thumbnail>data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAKAAAAB4CAYAAAB1ovlvAAAMe0lEQVR4AexdfXTN9xl/flmYkVo4LMM5iiVesqTWvAii1cwZJ6k/VNSykEyYEm2NHU5RpZ2hliFsBOtqRxI6p1GHRccy53SCkjckoYi36eL1NGgJEux+vt03vb+b19vce3+/+3u+9/j8nu/7832e5+O5b9/7i88T9VAeMNADPqQeygMGekAR0EDnK9VEDRLwxIkTlJ6eTqtXr/ao3LZtG12/fl3FhZEH6hFw79695O/vT2PHjqX4+HiPyujoaLp//z7l5OQwCgFvU3UELC4upn79+tHjx48pLy+PfHx8BB49ekQPHz4U7ehzN8LDw3lHhZH1OgLu37+fbG+IBOADkPDq1avUv39/Ki8vp7Zt24o+OcadEvrdCrW4KTygI6B9Zhs+fDjFxMRQ165d6cGDBxQSEkLdunXzWBY0hXfUJtzuAR0BHTNaTU0NARUVFSLznTt3TkjHce6ou91ypcAUHtAR0D4DftfXh3zXvEAd179AbTfE0sWs+S7DpewFYq0v3ksR60PHD0ve12VXUg8WHtAR0D6TVd28Tl3a+9D2H0yhJ6/nUVDKHwT6Tl4pZGvqgZPSxBoBqVl0LeVjat/Gto2ibF12ZeF9ZaT+c0D7DAjfnPQNpBd/PkmXmfCO2H5ca+t+fn70t66ToU6nRzSoi+U9YEs939iIDIialP9oM0yXldDuDsSMTYZaoQsF6IBUcIsHTLVoPQIiu0kCtG3XXmQlmeXcKeEV6LXXjzYFa3ugHgFBAgBmQ0pCuFtKfdAJoK5gfQ/oCAiSScB0mfFkmzvr0Cf1QKKuYH0P6AiIzCMB02UZhJBlSHfU7fVBB+oK1veAjoAglgRMR1lmPXdLqQ86AdQVrO8BHQGReSRgOogg65DurEMfdEigrmB9D+gICIJJwHSUkfkkWltvar7UhzEA6grW94COgMg+MNleouwJOOpFXcH6HtAREJkHAOFgOsqegr0+qR9tCtb2gI6ACDwA0sFsSE8B+qAbgE7UFazvgXoERPBBApiOsqcAfdALfZCoK1jfA/UIiOADMB3SU3DUh7qC9T2gIyCyjwRMl+9+PSGhT+qGRN06UJY05gEdAe2zHSbY111dTkhIoGHDhtHly5d1p2CkHuhXsL4HdARE5pGA6ch8qFdVVbn8VEx2djZlZWVR9+7dCXqgD7okUFewvgd0BET2gcn2cvfu3RQcHCyIgnYQpDmZn58vCGs/bubMmSLT2c/v0aMH7dy5U7Q76kVdwfoe0BEQ5JCA6SjjB0mBgYGUmZkpSIU24Pjx4+LnmgcOHKA+ffoIIt29e5fQHhAQINowDli7di2tXLmSfH19dWvs2rWLRo8eLdqkPowHUFewvgd0BETGkoDpwXSZ2rVrRyBhcnKyIAr6QZAxY8YI8mDc6dOnafDgwYKEPXv2pMrKSjpz5gzdvHlTZLcZM2bQnDlzxF0P5Hxk1ri4OIK8cexfWEaMRT8gGtTF8h7QERBPiSCXJMAv/Y5RYmIibdmyhebOnSsIiNdrGAPSLVu2jKKiogRxOnfuTGlpadShQwdBRozBLT7k+BUrVtTNz83NpdjYWJKy5+f7hKMxB5D6RaO6eLUHmtu8joBJSUmCTCBAbW2NmBuT/ypdu1JJo0MD6HL+Dvr84EeNypxV85rsl/NDnqoW4wIe3aDe+2ZTaJtrRE+EOqH/9u3bX1fU1fIe0BEQT59lZWUiU924fY8evlFCfu9eog0bN9Hkt9fTlHcyXCrnrcmkoLQyoePKr/KEXryOxI2RLO95ZaDwgI6AaJk9ezaNGjWKRo4cSZ06dRaJCcnJ3cAbHejEa0tN07AVBQYeqEdAabOmaaRpnofUryQPDzRKQB7mKyuN9oAioNERYK7fugR0IrD/3LePoocMpaDefTyCQeERtCEjw4kdWncoawLi46Z/HzhIP7O94Tp4+BCdvXDeIzhaVEjTU1OptOyk+NiJGD9YE3BdxiZ6/rlow8IfGhJMCxYuMky/GRSzJSCy32szphkeg+VLl7DOgmwJWF1d7RT5Anv1FuOlFBUXXarv3XPRSt63DFsC4tbDzYXrRFm5GCJJ9+e/bKbIoQ0/ZWMMgAmQH2zPIci4uNFoahI1tbVN9lu5ky0BO3bs2GRcQbZnQn5M+Yc+pYKSEjH2o5wc+umIEaLseKm4eIGAi5f+I2TC+HgaERtne423sNmn2Ob24qirmbpXdbMloKZpTQZq6pQU0T9s6GDbV5L+glR79vydZLvobODS6+meda0bM9YR5mta07rqJjAssCUgYh0ZFg5hKMKfDRNfeRq6CQOVsyZgQXERgQBG+T/CRr6ikmKj1JtCL2sCIgIgAD6S8TSgu5A5+eAD9gSEEzRNE0+DmuY5Cb0KpP8zDcohygOe9oBLM6CnN6/0eb8HFAG9P4ZebYEioFeHz/s3rwjo/TH0agvYE/DWrVs0btx4OnO2gqpu3fYILly8RG/Me5NOnTrl1eRxxeZZE3Dz+5sJP57/8MPt1DcokDr5f98j6N3raVrx7lIaMGAA7d61yxVx9No1WBNw3Msvuyhw336ZoH4Dvv1kC8xkS0B88/HUU36Gh7B/v6BmT8sYvkk3boAtAe/cudOgW1el/5GGRA0RfTjPJwotuGCsPPtXVXWr3ozjpWX12mRDY3uR/VaWbAnYWFB/M+t1OnzksK4bbxpASmRNnBNE5y8SJ0LUAWcBcVwLDeWnPoMQB1IxB5Uvv/wKQsHBA2wJ2Ngh0FW2DJg4IUkcRNU0jXDAdGRMDA0MD6cJE5OpsvKK6Cs8fEjnSvmTThxgTZmQKH7eqWka9e3zIzEuZeIEMU9UHC6N7cVhmCWrbAmoaRqdPXe+XlCRAbdmZ4qDpPiZJg6YQm5Y/ydC++K3FtT12U/GGAAHUCHtgXFnz58T81C2x1d374qDEPZtnMpsCYgglx07BmEotmVvNVR/a5W3dj5rAr4UP5ZKT5TSW4veof/anlq/sL158ATwmjIpeZK4g+zUV6a2NoZePZ81ARG50GdCaclvF1OP7t2ocyd/jwAfRGdu+St16dIFW2AN9gRkHX0TGK8IaIIgcN6CIiDn6JvAdkVAEwSB8xa8l4Cco2Yh2xUBLRRMbzSFPQGjIgcZchoF3xGHDfyJN3LGpXtmTcCIsHA6UnDUkK/CNE2j4uPHaFBEpEsD6m2LsSUgMlBhcZHh8TpaWGD4HozcAFsCGul0R934z+DYxqXOloDOHALFYVJ52LQlxMARrpaMk2Oc2QsRyWmWkGwJ6Psd3xYHcGBoCJ05WS4OmOLkMyZCgmjygCrqaJeYlvqqLDYr2/i2fC/NLuZlA9gSsH2H9k6FCieeJTARZZwVlDesRB3tANpxc0qUW4LvtXduLy1Z01vGsCWgpmn05sLFhscpY+N7hrwLN9zw/2+ALQFh/++WvE2fnT6LoiE4fKSApr8yxRDdZlHKmoCaphF+FrkmPZ1CBgTXvcbD6zl3Ah9Af5y7h4ZERbLOfvhPwJqAcADw61mzqOzUSXEjcryWczfwAXTsi3FQzR5OEZC9t5QDXO4BRUCXu1Qt6IwHFAGd8ZYa63IPKAK63KVqQWc8oAjojLfUWJd7QBHQ5lL1F9NtTjDoH2sC4hRKy/5i+nmyv9VGa8tHiwppemoqlZadNOQwLJnowZqA6zI20fPPRRsWjtCQYFqwcJFh+s2gmC0Bkf1emzHN8BgsX7qEdRZkS8Dq6uoWkQ9fybVoYCsGVd+714rZ3j2VLQFramoajBzO8eGMnyRe0pSvbx6EdtyUEu0AJkN+sD0HxTpgHCroA3BmEBLjIAH026Omtta+yqrMloCN3RSytKSEdu7YIb4XtmdCREQEbduaJdorLl4gEAsyYXy8/bC6cuTQaHppfALNn79AzMG4vE8+IUnouoG2QmN7sXVZ/h9bAmqa1mBwD316iHJzd9f14YaUqMiDpygDOHQK6Qh5EBVkTfv9ckFaOQZz5HqyzezS3ftjS0A4NjIsHMJQhD8bxvpIFmsCFhQXEQhgFAMjbOQrKik2Sr0p9LImICIAAuAjGU8DuguZkw8+YE9AOEHTNPE0qGmek9CrQKQIqFhgqAcUAQ11v1JuXgKq2LDwgCIgizCb10hFQPPGhsXOFAFZhNm8RioCmjc2LHamCMgizOY1UhHQfLFhtSNFQFbhNp+xioDmiwmrHSkCsgq3+YxVBDRfTFjtSBGQVbjNZ6wioPliwmpHOgKyslwZawoPKAKaIgx8N6EIyDf2prBcEdAUYeC7CUVAvrE3heX/AwAA//81GFr8AAAABklEQVQDAHDnC3DCAaUgAAAAAElFTkSuQmCC</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><list></list></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 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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="reportVariadicEquals"><list><block var="data"/><block s="reportNewList"><list></list></block></list></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><list></list></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><list></list></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 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%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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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 s="how 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