<snapdata remixID="12980060"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 9.0, https://snap.berkeley.edu" version="2"><notes></notes><thumbnail>data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAKAAAAB4CAYAAAB1ovlvAAAAAXNSR0IArs4c6QAAEcRJREFUeF7tnQtQVFeax//QzaPBB/ji2YAgqKi85CEKgg9AxVEjJMFk1kyyZpKdWMkkJqmprdrZ2dqqma2drbzWmVQqMcnOZpIZA44SHwhCABPxiWgUIu9nI6iAvN9sfaeHbppXkyx9Tyf3nKouhW7u993//fW593znO9+xGBkZGYFoQgFOClgIADkpL8wyBQSAAgSuCkwK4PXr1+Hp6QmFQiGpc729vWhra8Py5csltSuM8VNgAoD5+fkMPl6NHkk1Gg3Wr1/PywVhV0IFDAAsLCzEggULmPm3334bfn5+WLRoEeuVzpw5gzfeeEMS18jesmXLMGfOHEnsCSP8FDAA8P79+2hvb2fevPPOO3B0dERISAiam5vR19eHxMREDA0NSeIt+RIeHi6JLWGEnwIGALa2tqKlpYV5c+nSJahUKvb/7u5u9jxIQEgVtbl79y42bNjATxlhWRIFDAAk+B48eAALCwvY2trCzs5OEifISFOjBlY2tgxwst/U1CQAlEx9foYMACT46EWt/GouFmX/K+ZaW6BctRLtCgeTeBnSWcCO67zzFdzz3aWzQbf9qKgok9gUBzUfBSY8A44CeP34+0hsOYpLfs/Dd+uTJvO4oa4GThmvQR3zOKo8Eg0AjI6ONpldcWDzUGACgPfu3WOe3Uj/AO69lXDbb/qRb9OlLxCycBCV6h26Z0wahAgAzQMSU3phACDBpwfwCKLcFOhf/5wp7bNjl5SUIN6mFOVu23S2CMCNGzea3LYwwFcBAwDpuWssgJu87dEZsp8NCkYHB6b4lwDcpipHmWuCAYAxMTF81RHWTa7ABABp9Entm5MfInapFkBqo+CNejSbPxcXF2OHfSXuOMfpTphG5AJAk19/7gYMACT49AB+hNildugI/geTO0kA7pxbjW+dthoAGBsba3LbwgBfBQwApOAvvajdOvUxA7A96Kcm95AA3DW/FsWLN+tsUVB806ZNJrctDPBVYAKAjY2NzKPbp7UAtgWYLgQzeur0DLjboQ63F+mBo/lgASBfOKSwbgAgwTcewNY1T5jcDwLwkQUNuLVQf8slADdv1veIJndCGOCigAGAlAZFL2rFZ/6E2KUqtKzeJ8koOGlRI2466sMuDx8+xJYtW7iIIoxKp4ABgA0NDToASzL+hBgvFR6sSpEEwEeXNOGGg37mgwDculU/KJFOEmFJSgUmAEgQUhsLoKkdokHI4873UDRfP/dLAMbF6cMypvZBHJ+PAgYA1tfXg17Uvj37CWK8bHHf/3GTe0YA7nN9gMK5+izojo4OAaDJledvwADAuro6HYB3Mj/BRk9b3Fv5mMm9pEHIE24tuDYnUmeLAIyPjze5bWGArwITAKytrWUelWb9mQHYvOJRk3tIAP5U3YYrdhE6W52dnUhI0E/NmdwJYYCLAgYAEnx6AD9lADYtTzK5YwTgfs92XFbpU/C7uroEgCZXnr8BAwBrampAL0o+KM3SAnjXb69JvHzxxRdRVFTE1p7Y2NjgZ0s7cck2TDfnTABu26bPjjGJE+Kg3BWYAGB1dTVzqjz7M0R7aAG8ePEi3N3d2Ws2GwFICQcFBQV4xqcbBdZrdYendSjbt2+fTXPiWGaogAGABJ8ewL8g2sMG+VjNZiQqKirQ09OD+fPns9OgXotWyo1vlNJFwezg4GBdcmlpaSn6+/uxevVqg487ODiA3qPcvwO+vbhgFWIA4I4dO8xQMuHSbCpgAGBVVRXoRa0i56+IUlujZXUKXn/9dbzwwgugkamvry9738PDg/1+1apVDLSbN2+yVXOUTUNAEZx0C6X1vbTemJZ4Ll26VOc7/Uzw0fvUwz7r14evlXpoqUqCAHA2L7V5HmsCgJWVlczTyi//iqUjGvSt/yfWewUEBICqJqjVavY+VU946623cODAAfYsd+TIEezbp522O3bsGAOVek4CjQBzc3PT/S39rqysDD4+Pqxnbb/fiJ8tH8F5y0CdSgQgrUMW7cetgAGANBodnQkhAHcO5OLPi56Fnb09A4t6q/HN0tISw8PDGBwcZLfvyMhI1gOOXz9M64ppUTtVXigvL4e3tzcIdvrX4uhBBCakIN8iQHd4usWLNSE/bvjo7AwAvHLlCluYTrDVfJ2OlN50aIbmodpxLcrt16B/ZGbFiixmqJuf8j6WVJ3BCqv7sN76S+SOaJ8R6Uvw9NNPz/Ao4mM/ZAUmFCc6evSo9hbr4YF5Zacw0tUqyfn1BT2O5ofdDD5aD0x1aUT78SswaXm2nJwclhdIt9bZaJRYQLdgY2EcGmGLlXCzofgP5xgTAMzOzjZans3eToXL7x7C8IMao2ca9sSr6HUOBE2t2dvb60bRRv9QfEAWChgASAWJ5s6da/TENTUVCDz3C6iUFrB0XQX0d2H4vjaAPb5Zb30Z5W7aOV0apIjQilF5ZfWBCelYo+uC6RZMgxJq1Hu5uLiwQPLixYtxt7YSYfm/xNzYAxiqK4LSPx5Dd3IBCwtgZBhQWmOoNJ/9LQF4e5E+1T4oKIgNckQTCpACBgBSTI5CKNQ++OADFt+jAQEFlSk9/uDBg6xQZX1lKdZ9fQhzY57BcGs9lMuiMNLdBkt1IIaKs2DpvBx9J36tA/D6PG2e38DAAKt4ZU4A0qj/2rVCuKvdYWNtLQkVFLKqq6uHv/9K9sWWczMAkGYsqLcbBYRidtbW1qxAJVUrpUEC5Qw2VpdjS9GvYaMc15NZ2wH93YDSBhjUTtMpN7+EK3baLBeaJUlOTjYbvWn2pra2DvHxcew8pWw0wMvIOAu12h1r1qyR0rRZ2ZowCElLS2MAjs75TuatwtISLt0VGGm4oXubdhsZe2dlPyut0BX0JCvxS5nWVPd5dCqPtwrUG6efSEdSsunTzaY7V5o1euSRR8zqriDltZkyDEML1GdSjnf87XRs7ZjRE3FycmK1pqncr7m0ggsFcHF1hZcXv4LspEVxcQkGBvoRGKifhjQXjaTw4zuHYWjqrfTkexiouEgFY4z66OzmjiUpv2PPf5Tsai5rfY+lpmLXnj1QKpWTnkNlRSXL6omKjmJz4RcuXACVCsnJzkFoWBjmzdNGC+jnwaEhhIaGQqlUYN68eUY1GfsB0uWL9HTsTeLbE38np2fxw9OGYWi/kNFRK/WGFEymutEV/7IO69xspnTDwtEdI63axU3Uel69pqu6Rc+Y5lB8PPXoUSQ/NvV6lwaNBocP/xHPPvuPuPPtHfYIQbMzX+Xn48Bzz8FpyWJ2bqVlZeju7kGjRgNKoiVIKXow38EBDfV16OzsYl86T0+PKfUy5sssXm+zO9SUYRiKCVJQ+qmnnmLZLJQpfejQIdjb2aHu36MRuXk70N8Dy8U+GGq8DYWLP4bvV8FyoRcUK7eg7/NXARt7BmLny5d1FReWLFnCMmN4t1NfnETMptgpt4L4/X/+nuU/tnd0ws/XFw9aHkCt9kDxrW+w78kndAOHTz/9jH1u85bNOHXqNJb7+eHI++8jPGIdLBUKdHZ3IzgwAImJk+c29vT2IjMjA7v37OEtCRf704ZhqFwv9VYEH/V8lN9H02l3f7cJUft/hZH2u7CK3I+hmmvoz/wvqH5xHH1/+2colkbAeutL6PyVFzuphy8W6FbbURyRMmB4N02DBmXl5YiJ4VsE8/LlK3B0mA9fmc59TxuGcXV1ZbcVqpZPgxJ6vunt7UHX4d0I83TQhlysVcDwEDDYr2XKSgXLRV5QeKzFwKVP2K+an8vVpXnRdJy5DEZSU1OxZ5rnQFN/SSgemJqahpQU06+9NvW5fN/jf68wjNqqE0Ml5yaGXcaEBUfDMgrfGNQOO4ISEmiEnGRGD9ttrW3IyMiAt48Py+xWWk0+IPm+4k71d329fbheWIjme/cQF7cVtDRBrm3SMAzF7egZkEZ/xtpMwjAU5I2IiDBboSkAf5nOt8/4+RrTYybv28+xR+ymTSwjXO5tUgDlLoo4f+kUEABKp7WwNIkCAkCBBVcFBIBc5RfGBYCCAa4KCAC5yi+Myx7A8+fPs7ncjvZ2DA0NSkIETdHZ28+Bra2N2SRnSHLiYhBiqMDZs5nw8fGedMG9FBeksrKKVYagYLRcm2x7QJrnvnr1GhIS+FZhPX36NGI2boT9nDmyZFC2AGaezWR5fQsWOHK98JrGuyi98y1L45Jjky2AqZ9/jqTk5Amp8Pn559Hc1IywsFDk5eVh/1PazRqNtZycL+Hq6oIVK1bgyuUrCA4JNkh2pYVPa9dOzAin+fG01FQkP2r6UsjGzoHH+wLAMQtZKOk2Le0YHntMC0P2uWws8/XFa4deRVhEOLw8PXH61Gn85t9+g//530+wc8d2hPwdqqyscwgIDMTgwAD+8N+H8dv/+C0+/PAjFBUW4oWDB/Hxxx/j+eefh+e4JQACwPFlrHh8DTjYzMvNhd+KFXBxdjawnpubx0bEoWGhuHTxIlb6r0JtbQ28vX1YSllzUxP8V63C7du3EJ+QgPl/T8GnHtDS0gIKhRI11VUIDQ2Dja0Nvrl5E3EJCcjLzWPJGOvW6Quxk+GWllZcvXKZHUuOTbY9IC0NyMvPRyLnKqw0Eg8NXYuFCxfKkT/DhelyUyArK4stE/Xy0mZuS90oBEO1EuW8HYVse8BR2GhVG63L6O7qwjBldkvQ6DZNNXhUdirZVwOTPYAS8CZMTKOAAFDgwVUBASBX+YVxAaBggKsCAkCu8gvjAkDBAFcFBIBUOriqGl/m5KCjo12Si6FS2SF8XYRsK2KNFVnWANL653PnstksBO1tR3E5KRqtt7516xYDf/v2bWa7XloKLWQN4Gef/YVVbLWSqCLC+As6MDCIEydOIJlzkUwpQJvKhmwBpL3qWlvbEB4exlN/5OXlw9d3GagOjxybbAE8cfw44hO2QaWyndXrTvVeOts74O0zswpgHR2dyM/NReJPds6qHz+Ug8kWwJkWhezo7MR7776H4OAgqD08UF9Xhw3RUTiZno64+HgUFl5HT3c3S9G6eaMIYREReOfNt3Dg5z+Ht7d+e9rpgJipLz8UqL6Ln7IF8FhaGn6ya7fR57/29nacOZ2B/oF+lrunVrvB0XEBaEf39rY2WNuqEJ8Qh5MnTyEkOBi0zWzh1atwcnPDjm3Gc/yoRFv68ePYa0a7B3wXgP6/n5UtgDdu3ICVtTX8V66cVkMCkJJXV/r7szrXVDt6TUAASoqL2dazlKzq6ekFFzdXFBVeR2BQEBobNeho72BVU4216ppaNDbUI3K9di8VuTXZAkj7dBz/23HsTdrL9ZrTthi7du2ClZUVVz94GZctgCQ4bVSj0TSyjWqo+r+UjXrTzMwstlEN7UYv1yZrAOmi0zqP0tIyVvtaoZAGQor/0ZYVISHBsk3FH/3CyR5AufY85nLeAkBzuRIy9UMAKNMLby6nLQA0lyshUz8EgDK98OZy2gJAc7kSMvVD9gCKHdP5ki9rAMWO6XzhI+uyBVDsmM4fPlkDKHZMFwByVeBYahp27dmtKyJJiaTn8/IQHhEBtVrNfKPi5V999RWbKx5tlJI11c7oo8dYvXoN5js6wNnJyeg5ih3TZVofcHwSKJVrO5uRAQuFErSnMRUrWr9hPQoKLiE+bguoACVl0NBr7M7oCxYuRMSYtP6zmVnYuDEaHx35EAnbEljaf2dHB7p7eqBpaIC7Wo1t4/IERUKq0e/pj+8D43dMr6urx7uHDyMsMhI3i4pQU12Ngy+9xDKfk5KT8OYbb0KpUOCV115DZmamwc7orxx6mQlEPeC7f/gjUlJSUFxSwn7X2tqC7MwsrA4MQm1NDYJCgvHMM0/DSqndGlbsmC7THlDsmG4enYpsR8Ekv9gxnT+EsgZQ7JguAOSvAAC2Y/pF2iG+TxJ/aJsutmP6MrFjuqx7QEloE0amVUAAKADhqoAAkKv8wrgAUDDAVQEBIFf5hXEBoGCAqwICQK7yC+MCQMEAVwUEgFzlF8YFgIIBrgoIALnKL4wLAAUDXBUQAHKVXxgXAAoGuCogAOQqvzAuABQMcFVAAMhVfmFcACgY4KqAAJCr/MK4AFAwwFUBASBX+YXx/wM45W8gRiNrQgAAAABJRU5ErkJggg==</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 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 %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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