<snapdata remixID="14868897"><project name="U3L1-ShoppingList_Empty to Students FINAL" app="Snap! 11.0.8, https://snap.berkeley.edu" version="2"><notes></notes><thumbnail>data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAKAAAAB4CAYAAAB1ovlvAAAQAElEQVR4AexdCVRVR5r+kEXAfY0iuLEIikZtzWBUNIrBcTdCRu04k2hsNWMSZ+aYMWNP64nTy0yWYxa1XVpanbghMaPjGsUtIgqKSlQERFzYFBEBBUGk71eeC+8ByjPylrwqDt+r5VbVX/XXd+reqvtX3QYV6k9pwIoaaAD1pzRgRQ0oAlpR+Uo0UCsBExMTkZeXh3v37lkUOTk5uHDhguoXiTRQg4AHDhxA06ZNUVhYiPz8fIuipKQEbm5uOHXqlERdIHdTjQjIkc/HxwfaMyliY2OxYsUKLF26FMuWLROkoP/EiRMiztBNSEgQcWfOnMFXX32Fzz//HM2aNRN5eG3t2rV4//33xajKsp+FBg0aoGHDhoL4cneNHK03ImD79u3x+PHjSjg7O6NRo0aCEBcvXkTLli3x008/oVOnTiCxXn31Vezduxfnzp0ToybdVq1aoXHjxoLEHMlIJhIuMDAQnp6elWUbyqnub9KkCZKTk2HWP1W4TWjAiICOjo6COCRMQEAAOnfujL59+6JXr16YNWsWvL29UVZWhvLycjg4OOD69esYP368uP7yyy+DeT755BOQmIsXL0br1q3Rrl07+Pn5oV+/fjh//nxl+ZTxLFCOTWhIVcKsGjAiIAnB0YguyTNx4kQMHToUw4cPh4uLC0aOHImFCxdi9uzZWLBgAebMmYMhQ4YIMN2IESPA5zgScNGiRZg5c6YYLUeNGgVe79OnD1q0aFErSkuKQbm6fPrN2nJVuE1ooAYB2fEkwfkju5A6vwdyFgYiZkkY9vxxpsDOJe/g+8X/iF2/n4Hti6aJOP0a3W/nT6oRx/inIXthLyGj3bV94vasy7cJ7ahKmF0DtRKQJCi4mYKA1s7I6DcXPedFYNDcL+oVPX79n/AYNRe3wtbCuVVHNHJ2ECMgZeswe+uVAKtrwIiArA1HPwKoQKJ7H3gPmyJGJsbVF7jEEx8fjytXriAzJxe5gVMoWhBQl0ESikj1Y9caMCIgO70KgFcXn3onHwmWnZ0tyEZZ9+/fR25jb6FkXmMcISLUjzk0YFNlPoOAFXBq6C4ISELo5DCHyzKpFcoxBOMU7FsDRgRkU0kGgrdgnQwM62Cc7qf7c8Nt27ZF9+7dxTojyzGUzTDLZZyCfWvAiIDs9CpoFKyoECOgTgi6OphO99N93jCXZLjQfenSJSGDamYZOhhWsH8N1CAgyUToRKC/vsGyHRyezHr1sqlq3U+XaRinYN8aMCIgm8qOJ7TxTwtWjYAkRX1CKxx880L3iTxNojbi0q+D1xTsWwNGBNQ73tCtT9LpZbH8Y8eOgc+BVC/j6TLeEIxTsG8N1CAgyUBog5FYKnnifzISkhwvEtbzs4zBgwdDX45hmGqmq4NhBfvXQA0CkiSEdkOsJKBOivpyn5SvSdBYTj/LparpNwTjFOxbA0YEZFMNCaD7SRD669MtKioSFjUeHh61zoIpj/VRsG8NGBGQnU6SEdrgZLYR0NXVFTRopTkXTbsoj2qmq4NhBfvXQA0CkoSEdoM0GwFptErT+8zMTAQGBgo5VDXlGoJxCvatASMCsqn6CGRIBFood+3aFc8L5qMR6tGjR2GIu3fvirJeeeUVMA1lGspmmPIZp2DfGjAiIDu9CtoYWEFUiA1KaWlpqA1cTqktnnG0euHekKoyK8Rol5+fL577SDQdVLNhOobtB6olT9NADQKSEIZEYHjHjh1YsmRJreCGo6ddYz5u72QZhuCoN3fuXAwaNAjcyMRrrCDl0k+XYJyCfWvAiIBsKjueJNDGPjFacZLAzUhTp07FRx999FwIDQ0VBgc00TcECfjll1+CCA4OFqMhZVOuLp8u4xTsWwNGBGSnV0GjoDYV5q2Uu+C4R4S3VJKE4G43utXB3Wzp6elwcnISxOJ1PvOxHPoNQfJdvnxZpKOaq2Rr935GKNi9BmoQUCcIyUA/Jx5ff/01iouLQWIxjuBSyqpVq8TkIjo6Gl988QUOHjyIs2fPim2avDVzmYVE5UakjIwMQTTmJfhsSPJxpx1lUdN0eY2gn3EK9q0BIwKyqex4Qhv/kHEtDaWlpZg/f77Ynsn9viQHwTTcxD5gwAD07t1bkIu3ai6rZGVliT3ETE+LZ5bx6NEjkYZ5dfKR3CkpKXCpKKVocZ3l6hCR6seuNWBEQG6p1Dufrl9ZKuLj48C3Fvv374fhxvVbt26JSQTTkWhvv/22uO0GBQWB/pCQEDCehCNIVLrNmzcHSUfycU8I3b7p3wolsywdPB5ERKqfX7QG6qq8EQG5PMIN4SSKg6MLWjQoxpu569EkdR9KCu+Kg4N4eFBtuHHjBjjKHTp06JnpuGzDEfL48eNwvX0RjptnoZvjLVFPyiVYFo0VRKT6sWsNGBGQo9TDhw9RUFCAXqOm4Ub3aSjxGY4urRvhNdd0hLpdqVf4OefBzW8grncZh/PufcWs++bNmxg4cKBdK101rkoDRgRk9IQJE8RJB/n37uFKyyBc6RBqEWTlFcLd3R3Tp08XR3mwLgr2r4EaBGST27RpA67hjR07FpaEuu1S+3KhVgLKpQLVWmtqQBHQmtpXsms/otcu9GJiI/iu+ocfDuBSUlKtxhZ8g1Pf4NuigwejwdUAE6tpt8mkHgFpKhYTc0KbdAUjwN9fmIhxXdLc4HmJr702FAkJZ8FTae2WXSY0TFoCcr0zJTkFY8aMBs8+NEFX9ZqERxGPGvX3YlGei+/1WvgvqDBpCRgfF49f9etn9a7y9w8QJ8davSJWqoC0BMzKzICnZ4enqj3tShp+PPajuM532YcPHxb+aO3ZraCgUPj5w/D+/T8gL++uWMBn3PPA19cHV1JTnyeLXaWVloB85UeTsaf1ZkM3V+zasxdpV6+CE4aUlFQcOXIUJ2JiUFxSUpnNs6MX2r70Ek6ePAkSMTf3DvZo+WJOxCIyMhIREX/FtWvXK9NX9/B8nMfl5dWjpQlLS0A3N3dhZPG0nt74v9/CraELli9bgRvXbyA3Nxc3btwErXtu5WRXZuOt/HR8PPwD/JGdk6NNLBKwLiICsdrkJiMjCxlZ2eLLApUZqnlIZmcXl2qxLxT8RWWWloB9+vbF6dNnntpZ8z+aj98t+h0+++x/8JtZM/Hxxwvw1ltT8Yc//RE9e/aszDd16hTMmDEdXTp3xtx/fg8jRoRg89Yt+Nd/+xfMm/cBfvsfCzB69KjK9NU9iecThdV49XhZwtIS0KODB27fviUseKzV2bQe4hqjr5+ftapgdbnSEpCaDxkegm2R23DqVJx2a32Ah6WlFgEnMUcOH8H27d9j5MhQVkVaSE3A5i2aY/KUyXBycsSG9euwcvkKiyBSu0V7enkiPDwMNNCVln1aw6UmoNZ+8c+vQc2eMwcfzPvQIpjx7rviq1NCuOQ/ioCSE8Daza9BQJrD8+Cg3bt3w1TQvJ556sL276JEmXFxcaDls7Ubr+RbXwNGBMzMzBQfIGzVqhW4481UpK+fj1YbwurEwMxIUS53xXH2R/N/66tA1cCaGjAiYF5eHrgbja+eSI5nuRz1uIrPdI3vpsKjiWMlvF4eWOk3jHe/EQOmZ7ncKxwbG2vNtivZNqABIwJy5CM5SJJvvvkG3Di+YcMGbNy4EevWrRNuVFQUtm7dCtq0NWrUSOwbrtkOB7iM/m3NaC1GL58u18G0KPUvsQYaGLadBpIkBsFvBHOU4kZzHiIUFBSEYcOGgUeqcSM6wzw3hmkNy6DfqedIOrWC6XUwf62JLBjJbaL79u0X64FbNm+GJcB3xLt370F0dLQFW2qboowIyBGQR2iQICSeo6Oj+N4vRzpuVOItl36m4/oVR0Gm7dD9V0ate/h/i1C667+M4hhw9B0sRkzm4WQnODiY0VYDicfN9qGhryNMW5P7h8mTYQmEh4eDtoCdO3cBrbGtpgAbENzAsA48hIgjH0fCs2fP4qyJOOcVhkODltWJjQ7DRJk8rIhrbzxfxlC+Jf137twR4jjREp4X+vl5mbt27YKyslLcLyr6eQXYQS4jArI9NBefrI0EH374IUzFjBkzTNq+yXQsk3uPrdnxbOfp+NPo378/vVZF7z59ERcfb9U6WFN4DQJaszKWlF1QcA8ttFdx1WUePXpMex6MwrX0a1i/bn31y08NR0cfQlJSkrgep71brj7BeprlTft2LyH39m2RT8YfaQlYW2dzUsSP54SFT0Knzp3QoUMH0Jj0zbA38emnnyFyayTe+ad3QHJ+suT3OGNgzsW8LVq2QkZGJrZ/t117v+yEtWsj8MHc93E56bJG6kiRrza5MsdJS0BOqmhAatj5nHTx82E7d+wUWyYLCwvAE8NmzpqJN954Ay+1a4fRY0bj/oMHCPD3g7evT2V25r108QK4wN69RwCSLiWBO99CRoSgo0bmIUOHIis7uzK97rl7N1+sveph2VxpCcgNSTyfunqHDx06BGPHjQVnxxMmTkS3bn4YMWIEvL27Ijh4sJgtd+8eAM5kmzVtWpl92LDXMFQj2eDBg/DWtGnCQrpLly4YN3483FxdMXJkKIKC/q4yve7ha0nWRQ/L5kpLQJ5d6OLsjPT0dKv1Oc9H5EGgXNayWiVeUPCLZpeWgFQcRzbuftu1a7d4vrPEIjRl0Ah239592vNihjgEinWRFVITkJ0+bPgwsWcj/M1wiyxCc6Gbi96h2i3Z2gvxbL+1IT0Brd0BsstXBJSdAVZuvyKglTtAdvGKgLIzwMrt/+US0MqKU+LrRwOKgJoe06+mI+Iva/HV0qUWweqVq8TXpDTR0v9LTUB+F2XbtihcTU/HxEmTMOu99yyCyb+eigfFxdi0aTNYB5lZKDUBeYrVeO1VGd/ZNm/eDA1dXCyCJo0bY0BQEMLCwnDgwEGZ+SfvGdH8XJi3tzecnZ2sRgDKplEEdyNarRJWFiztCHjxwgWjU67qqx9u3b4Nvt4ztTxahicYmHWZms9e0klLwLLSUri5udbZj4VFRfjs089xULtVJiengCei8hCjqG3bxImohw8fwZ7de0C7wZ07doAHX65ZvRppaVfrLJsJmjRpjOLiB/SaCrtKJy0BGzg6oqzsUZ2dWfH4Mby8vJCZlQU+M+bfy0fM8Ri4urlj187/x507eRgUPBgxJ07Ar5s/crJz4Ovri6Tk5DrLZgJaTvPAcvplhLQE9PbxQUpqikl97u7uigEDgvD66yHaJKUh+OzopBHYRyMaKspx+VKSsBVMTUkBTasCe/WEq7OzSWXfzMhEew8Pk9LaYyJpCchTTpMuXqqzT3lSxNhx48SRIgEBAcIiumNHL9Capf8r/TFJm8n2698PHTQS0VqaB59zsxOtbOosXEtwOj4O/Wxgc5RWFav8S0tA3vZ8fH2wd+8+8dxmae2XlZWBdoi8XTubOFpauo6WkCctAalc7oHu2TNQnH7PU/DT0tK0yYP5cflyMjh5oYk+68C6yAqpCchO5843LkT7aqOhK0FFQgAAA0JJREFUuT/RpZf/ZJ9JiHheZB1kxnMRUGZFqbabRwOKgObRqyrVRA0oApqoKJXMPBpQBDSPXlWpJmpAEdBERalk5tGA9ATkscQ8o099Md08BKurVKkJaPoX07tCX0KpD5dH4HHpJyHhLBITE+vqI7u+Li0B+SYiJTkFY8aMhouLi8U7mW9ieEoq7RIrKiosLt9WBEpLwPi4eNjCoUD+/gHgSGwrhLB0PaQlYFZmJmg4oCuchqRR27aBZ1frcQ8eFGP//h/0oHDz8u4KO0ARqPajl8HzAKsf/VYtaWWQb2CupKZWhmXzSEvAx4/LxSGSeoe7u7kJb1z8aRz78Th4gHm5lgYOT1TEiQrjTp48KUiZm3tH2AeePBUn8vGnbZs2aNy0GXge4HfbosDTr+K18g4fOgyeir9m9Rph/ACDPxoiPC4vN4iRy/tEu3K1WbTWzc0dRUVFws8fHhR5WrstOzg4IPrAAWzZtAk0UIiNOY4LFy6Izzdsj4oC7Qg5uiUkJGBdRASOH/uR2QU4AsbGxOB6+jVh43f+fKJ2ez2H1StX4ty58+ID2deuX0fZoypD2OKSEji7WP4ZVFTYBn6kJWD1L6Z7eXniD//9J0ycMB6LFi/C2r9GoG+f3uKr6T169MCav6zBn1ethJ+vT40vo+v9yBGQebv5d8PEiRMEpk+fjm83b8LHH/87Vvx5OWb9Ziacnao2Qtn6F9P1tpnLlZaAHh08cPv2LdAk3lzKratcyqYJmK+fX11J7fa6tARkj4YMDwEPizylPcfdv/8A3GxkCRQUFOLI4SPYvv17cXQv6yIrpCZg8xbNMXnKZG0y4ogN69Zh5fLlFkHkli3aDNwT4eFh4BenZCUf2y01AakAgntzZ783Bx/Mm2cRzJj5rjaZ8aZo6aEIKD0FrKsARUDr6l966bZLQOm7Rg4FKALK0c8220pFQJvtGjkqpggoRz/bbCsVAW22a+SomCKgHP1ss61UBLS9rpGqRoqAUnW37TVWEdD2+kSqGikCStXdttdYRUDb6xOpaqQIKFV3215jFQFtr0+kqpERAaVquWqsTWhAEdAmukHeSigCytv3NtFyRUCb6AZ5K6EIKG/f20TL/wYAAP//9Kx9ZQAAAAZJREFUAwA7PSmddwMSHwAAAABJRU5ErkJggg==</thumbnail><scenes select="1"><scene name="U3L1-ShoppingList_Empty to Students FINAL"><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 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><list></list></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="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 s="reportVariadicGreaterThan"><list><block var="start"/><block var="end"/></list></block><script><block s="doSetVar"><l>step</l><l>-1</l></block><block s="doSetVar"><l>tester</l><block s="reifyReporter"><autolambda><block s="reportVariadicLessThan"><list><block var="i"/><block var="end"/></list></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="reportVariadicGreaterThan"><list><block var="i"/><block var="end"/></list></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><list></list></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 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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 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