<snapdata remixID="14925426"><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,iVBORw0KGgoAAAANSUhEUgAAAKAAAAB4CAYAAAB1ovlvAAAPcElEQVR4AexdCXAVRRr+OyQhhBtWAnJoNAGKGxJgOdZSKHGJsMsGkENROUQuVym3VK5gCjlK3AVWkcsjW3JvIS5IQGC9SIIhpyQgZ0hIMBJcVmAFNAnsfH/olzcvCS/R8OZlul+9b/6+/+6/v/yTmenp53NTf7QFLLSAD+mPtoCFFtAEtND4WjVRuQQ8fPgwLV++nJYtW+ZRuWnTJiooKNDzopAFyhDwk08+oUaNGlFkZCQNHz7co7Jfv350/fp12rZtm0JToPZQTQRMTU2ldu3a0Y0bNxhCCKpduzb5+PhwvLi4uFzZunVrcs1LT0/nsi1btuQ85NerV4/TZPsVybCwMLVnRaHR+ziP9dNPPyXjgsiBpk2bUnZ2NhMQp+U2bdrQ5s2bKSAggKKiohwyJSWFw8hDHUi0i7aWLl1K999/P7dZq1Ytlkh3B9S/o9CNe4UFTAR09Uj+/v7UpUsXat68OQ0dOpTJ8/zzz7MXi4mJcUh4rKCgIHrppZfom2++4YENGTKEgoODOQ3er0WLFtSwYUOu46qnvDg3og+2t4CJgK5eCd7v3LlzlJWVRadPnyYZv3btGqdJiTyUAeABR4wYwfmnTp1iiXy0g7irjoritre8HiBbwERAZ09U29eHfFc8SA3efpD8Vw+m7PWzqg05G2ZzWxffGc/tQ0fztPdM3pH0RwkLmAjo7I3++30B/SbQhzY2eYpW1oqkdhP/Rvl1O1D3QU9Tt4FPUI+IydRj8CRGcFAIp0EGB4VSp95DqW1oTwo20oG2E/5KzUfMZ7QY+SqFPL2UQse/QVd/v4DOj99NgX5GN1I28Cle9kEJ6+tBmu8DOntA2Oaobwj98fFJNGXKFCoqKqLEhAT6z5JxdHHpePr+tVH0/cIxjOLdazgNsnj3arq86gW6vmUJFRvpgCRVnTp16KeffmJPt2/fPsIpOTExkbbcNQHqOF32gRP0wfYWMFxP6RhBFMSk3OPX3+SVZq/8B7XanEutNrlH6815VH/NEQYuQurWrUtCCL7HiPad8VDkk1DLuhBAHqTGHbGAVzVahoDwQJIA/gGB7JVAIKSvmf8Xyh3dmvLGuEfu6FZU3+cGnThxgomFNmU7kIijTUjEYRWEZRriGva3QBkCggQAhg65f/9+gvcCMc7l5VHDh0ZR0HN/R7Zb1PLzZ/LJgmgP7ZQnUQbpEohr2N8CJgKCHBIYOjxTXFwc5efnk79xTxBpTUa8AEGtFmxnGbLlLMv73s+k0A+/I8iQLTmcdpNusuzcuTNLtCfbB9EQlhIFEJdAXMP+FjAREGSQwNARnjNnDuFGM+75Ge6Mii5+R75NmlNhQS613XGRbly9wqTzCWyAKgYEXT+eYsjSb0ZGBkfQHgCSQSIREnEZRhxAXMP+FjAREESQwNARhtfKzMzk57kPjxpHefP+ROeiH6Pzb/6ZTvyhCWWN72igE50a1YZORjY3wh0pLyoS1anIN8Dg7E1e4YJVLrI9SABPWCABVICUQFzD/hYwERCeRwJDBxlkHHLoqCdoTkELeiW/mVsEvJnKFyA4daMduRAB7QCDBw8mLFTArRjEoQ9SAnEN+1vAREAQRQJDRxgeUOLF0UNoYbN8WtKiwC38zqQRTtvwcgDacG7P19eX/Pz8KDY2lr2r1IcyAOIa9reAiYDwPhiys0QYK18gC38uRHYZBD23okyaawLqO0PmCyH4NI048p0lwhr2toCJgPA8gCQCwsDWrVv5fiCuae9deZAYbyXwRUjJLRnBYVwZB3Z5wGExtFO/fn26++67uT7akigsLCQAp2KkkfGBBFDPiOqvAhYwERATD4AEGDskgKtYSKRlT+9DjBl9+SIEFyMALkhwgXL18Jcoxl4NbV25coW+/fbbMgTcsWMHnT17lrDGULaN8oCMc0P6YGsLlCEgJh8kwKgRdsbLK9ZRo7lbqeErG9ziZtvehP/zcnNzCXBuB2Hc3AYBu3XrxuSEPuhFHiTiGva3QBkCYvIBDB3SGT+cz6eT80ZQdvQYt6hnPIZDXSzpBxB2RteuXQnvgAQGBrK3dNWHuIb9LWAiILyPBIaOK1dgwIABfKW6dnEU3VXbhxpXAv87msierVmzZgSgndsB+qRuSMTtAz2SiixgIqCzh0IFGW/fvj17KcSbPj6Ln3zgERyehECWIIcfz+FRHNc1DihvCP4i7IzRo0dT//79+fSMdBSClEBcw/4WMBEQnkcCQ4fHQjw6Opq92ZOzFtKRFr0pPvMkxSWl0hdffMHywKEUQ6ZR0g9ECUdOUf6L2ynLrxmaICzFz8vL4/qyPcgNGzbQ+vXr+QoZcRSGLgnENexvARMB4X0wZGe5c+dO6tChAxMF6SAI5KJFi9gryrizjI+PZ8KhHNJR9tixY2XK40nIRx99xOmuehHXsL8FTAQEWSQwdITxqCwkJITWrVvHpEIagNXNeMvtwIED/OYcXr3EKRXvFQO4uEA5YOTIkXy6RdgZuBWDt+eQJvUhDCCuYX8LmAgIjyWBoXegXAoICOCl85MnT2YCIh8EgcQqGdxiQVlc6fr7+/M7xMePH6ecnBze1gPlYmJi6LPPPjPVh2eNiIggyAvp/0YT7AlRHuAEfbC9BUwExClRkgsjf6peOo0dO5Y2btxIixcvZgLh/zWUmTZtGu3Zs4fwCmZycjJhJwQ82bhw4QKFh4fzO8AzZszgq2c8ygsNDXXU37VrF+EJiJRt8vZCHeejbU1ANoctDu4GYSLguHHjHF6oqKjkue9DcdPpXO5Z6tvSj3LjPqS8+O0Vypjo6XTonysrzJf1O9W/xu0EFV+g4L0zqbPfebq1dpX1X7p0yV2/db5NLGAiIB6LYe0fvNCFS1fp55fTqN6SHFq9Zi1NePVtmhi9qlrlKys+oNClmawjf9J+9oA//vgjb4hkE/vqYbixgImAKDtz5kx65JFHaNCgQdS4cRN2TDeNjDsNXOhA57Bhw/jtOUOl/ipggTIElGMWQjARhPCslPq1VMMCFRJQjeHrUVptAU1Aq2dAcf32JWAVJnbf3r3Ur09fCg2+zyPoFRZOq1etqkIP7VtUaQLifuOXB+LpYeOCK/5gAp08k+URHEpJpilTp1JG5lG+7UQKf5Qm4MpVa+mB3/WzbPo7d+pAs+dGWabfGxQrS0B4vxnTnrV8DhYvXKC0F1SWgHhltCrsC7k3mItLyZFqOly7erWaWqp5zShLQDy3djddhzOPcBFJunXvvk89+5Z/ykYZABUgN2/dRpAREUOQdFsUFhXdNt/OmcoSsEGDBredV5CtS6eOFJfwFSWlpXHZ7du20YCBAznsejiVfYaA7JyzLEc/NpwGDo4w/seb6/YU664vrrrcxGtUtrIEFELcdqKemTie8/v3/a3xSLIRkyo29mOS6ZxZzuHee9o4UtesWkmoL8TtdTkqKBhQloCY6549wiAsRVj3HvzI09JOWKhcaQImpaYQCGCV/cMN8qWkpVql3iv0Kk1AzAAIgFsyngZ0JytOPthAeQLCCEIIPg0K4TkJvRpk/pkGbRBtAU9boFo9oKc7r/XVfAtoAtb8OazRI9AENKZPL8cyjGDRV2kC4spXL8eyiHm31CpNQL0c6xYLLBTKEhDeTy/HspB5t1QrS0B3y7FAUKxmuWUnN+LXZevlWL/OfjWydkXLseQSLCGEY1wgIpZXYYUMwsiIXrCI+vTug2AZuJZBXaSB1GUKGwl6OZZhBNW+FS2BWrJ4CYFozvbAMissr3pv7Vp6eV4UZ2EHsIOJBznsfMDyrZiNmzhp/rzZFLtnN6Hua6+/QY8+OpTTXQ8V9cW1nB3jyp6ChSj1cM4Tu3HDB44lVyCecx4IJ5djgVTOeTKM5VeAjDdu3IiDKI/lXBzRB4cFlCUgLKCXY8EK1kJpAurlWNaSD9qVJiAMoJdjwQq/HL+2pvIEhAGFEHo5FgxhATQBLTC6VllqAU3AUlvokAUW0AS0wOhaZakFNAFLbaFDFlhAE9ACo2uVpRaouQQsHYMO1WALaALW4MmzQ9eVJ2Dvnr3c7t1yJyYaK2N6dO12J5quUW0qTcDwHmGUmHSIb0J7etaEEJT6dTr1Cu/padVepU9ZAsIDJaemWD4Zh5KTLO+DlR1QloBWGt1VN/4YXNNUiStLwMuXL1d6jr/OyKTKbDQpG8QegTJcGVmVvhBRZZqsMWWUJaBvLd9KTxI2qjxx9AjveIqfckBFSBBNrp7GknukSzw7dboMupV+vpXvi9vGalgBZQkYWDewSlOF1dHAiazTXA/ynjatadKEp/kqGnnyVIr01W+/xeUqc6gTWLW+VKbNmlJGWQIKIWjO3PmVmichhKOcECVhIQRfPQtRIlFACAHhSOeIm8Pqte9yeTfFbJutLAExo68teJWOHT+JoCU4mJhEzz4zwRLd3qJUaQIKIah9u1BavmwZde7Q0SM/04X/HcO6dafYj3dRn949lfZ++CNQmoAwAPDCzJmUYVxkeOqnulLS0yhiyKNQrTyqREDlraUNUO0W0ASsdpPqBqtiAU3AqlhLl612C2gCVrtJdYNVsYAmYFWspctWuwU0AQ2T6i16DSNY9FWagHh0VrkterOoOm/RHEpJpilTp1JG5lF+jEcKf5QmoN6i13rmK0tAeD+9Ra8moGUWKG+LXpDStUOuy6xc813jsg0pXfPLi+stesuzis3TytuiVwhBWMe39p33+LkwTDBu4jMQnD5m7BOcjue5SITE9rsIS0yZNoODyAOwZhAS5SDLI7TeopdNptahvG1x4bUy0tLoX9u3E9b7OVskPDycsHvqyTNZnAdiocyokZHOxRzhnn370bCRo2j27DlcHjuk7vv8c3py0mRHGRkory8yz+5S2f8BhShZu+c8wUIISvgqgXbt2ulYpYJ9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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 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;" 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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 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