<snapdata remixID="11195159"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 7, https://snap.berkeley.edu" version="2"><notes></notes><thumbnail>data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAKAAAAB4CAYAAAB1ovlvAAAAAXNSR0IArs4c6QAAFBFJREFUeF7tnQdYFcfax/9HOkhVbI+AAvbee4mgV+xe8NqvsVw1YIwxxhsVe4v1M58aa9RwFaNCrKiXRBM/a+yKLZGuiIlGQDxUwe95R3fDCnIWOJ7lsDPP43M4Z6f+5+fMzu7M+2pevXr1CjxwBRRSQMMBVEh5XixTgAPIQVBUgQIBvHbtGk6dOgWanTUajcE+nZ2d0atXLzg6OioqCi/ccArkA/DEiROoVauW4WpQQEk3btxA3759Fa0DL9wwCkgAvHLlCipUqCCWnHcEZPN1AaMh/S6sY+i6u7s7Hjx4gKysLBa/bdu2uHDhQpFbU6NGjSKn4QmMTwEJgCtXroSvry9rxcKFCzFv3jycPn0aPj4+bFqka6GhocjNzUXdunURFhYGW1tbtGvXDgMGDMAnn3wCDw8Plp7iEsybN29GVFRUkZWpWbNmkdPwBMangATA5cuXiwBmZGTA1NQUTk5O0Gq1DMBy5cqxFqanp8PKyoqBaG9vjyNHjsDLywuPHj2CtbU1i/Py5UtUrVqVjYYUr6hBALmo6Xh841JAAuCyZctEAJVuhqenp9JV4OUbQAEJgEuXLhUBtDI3Rc6qzrAy0+CSdWtYmpkiwq6tXlfF1snR6P98P2umXeO/4UH76WKTa9eubYDm8yKUVkAC4JIlS0QAM1OfwX3fYJxuPAv1O/Z8DYmdHRJiItn0Kgn0MkWjkfxUpbobMrOzZbXPdkM3mOMlEkaHi/Hr1KkjKy2PZNwKSABctGiRCGC2NhkJB1ag7thVYgtTfk+E9ZI+8lqs0cBszWXx/k+4fywo8Y0f9sE7ej0ejDouXq5Xr568cngso1ZAAiCtfP38/NhjlZdpKQg9fByjRo3CgQMH2Cr3+ZPHsF4sH0CT1RdFcXQ90K68pRvi/3lMnOLr169v1MLyystTQALgggULxBEwJ/05jv54in0/dOgQ+vXrB+2zJ7Be3Bc1N1/Gw7mDkJ0YDQef0Ug+tp19Vhg5G1HD3F+XrNFAs/ICZs2aBbq31LUSrvqNN+JGHhVr3aBBA3kt4LGMWgEJgPPnzxcBzM1IxZHwn9iIKIS0pKeSEVBjbgHrhh2Qduss+9RePfmXGPTQevk59iiHQk5OjvhKT4gkPOim79W2dUfsiDAxfcOGDY1aWF55eQpIAJw7d+5fj2GytDh0/IQ4JVN21laWyJzcQlbO1b++hLjULPZskAFWrVqB6YSp2eXbnogedliM07hxY1nl8EjGrYAEwDlz5ogAarLTcPDYj5LngjVquGJF28qwMZWueAuSYPSe8/g92wTx8fHssqura6FKuQb5IGroITFOkyZNjFtZXntZCkgADAwMFIEzycnA/rBw9O/fny1Edu3ahZfa50VahGQtPsXemFCgtyeFhRo7e+P+4ANilGbNmslqAI9k3ApIAKQFg/Au2DQ3k62C6fuYMWOwbds25Ka/YADW3HodMeOawiM4Gn/uWooKw2e8/hwyDVEj3zy/02iQsfAn2NjYMIXodV5hwT24L377x+uH0hSaN29u3Mry2stSQALgjBkzRADNkY19B4/ixYsXOHv2LNtUgMw0BqCJrSNyUpNgVskVNi28oL1ygn0mH98BE/uKyEl+wlbBafNPsPTt27fHzZs3C62Q53f9cc8vVIzTsmVLWQ3gkYxbAQmAX3zxhbjosNC8xN4DYZJ7QBoBbb/sL7bYY1cUokZ4wmNnJPtE3uMlGg20835kb08oPH/+vFClau0ZgLu+IeJzwFatWhm3srz2shSQADh9+nTxsYtluRzsDj0kAimsVukVGW3B0hUSEhKQmJj4znfHQnoh37ohvrg9cC+LT6F169a6iuDXy4ACEgA///xzEThr01cIDjlosN0x9UL9cGvAHhFY2sjKQ9lXQALgtGnTROBszID/7Pk+3wgojFAkzbvOjAiyFeV6wwODEdH/O1Fx2uTKQ9lXQALgZ599JgJY3lyDoO9CJQ+iSQ5hynx7Ci3p90YHh+Bmv92i4rRw4aHsKyAB8NNPPxUBtLM0wY7gfQabgpscHobrfXaJinfs2LHsq89bKD0XPGXKFBE4eytTbNu5p8ApWB/HNXfs2MGeLdKZE8qvWdgIXOu9U+ySTp068e5RgQKSEXDy5MkigI425tgatJt9379/Pzuq+T42CNDpt9jYWLQ49k9c8QkSJe/SpYsK5OdNlAD48ccfiyOeU3kLbPk2GPQ4ZcWKFUwpOmAkJ5w5cwZ5p1DaCUMn5tatWydJTvAtXrwYw4cPR8vjo3C557fiPWbXrl3lFMXjGLkCEgADAgJEACvaWSFq1xwExZZnG1LpPTFBIayCL168iKFDhyIoKAiDBw/GV199xU7GEaS0Batnz56Ii4sT5Zk6dSpWrVolpqdjl3QEYObMmYiJiUHr8NG42GO7CGC3bt2MXFpefTkKSAD09/cXAXS2t8bdoEB898AOtE2LHj4TKEKg3S3jxo1j0NGK9dmzZwgPD0ePHj1w79499ltSUhI71rl3715cvnwZdOyTAh1ep02q9OqPPlu42GJEWih+6b5NBJDy5aHsKyABkKbDNm3asFZXcrBhh5KCHUfi2C930LRpU3YAvbBAca5fv65TtX379oFe+3355Zfs02GTNyzK5eK811ZxhPT29taZD49g/ApIAHz8+DEiIiJYq5xsLVFn/3D2d1h6LdC+5uPp7iIg9HveHc3F+e5qkowpdoLZDg3Oe29l5SUnJ2PQoEHGry5vgU4F8hkn2rhxIwSzGK1atYSTo5POTPQR4X5kJKKjoxl8ZCFLzvtmfZTL81BWgXfaB1TCcGre13zKysJLN5QC3ECloZTm5RSoAAeQg6GoAhxAReXnhXMAAfwQHo55c+fhj8ePDUKEo5MTxv5rHCZMnGiQ8kpzIaoGkBZap8+cQ+dOHRTpo4hbd9CwQT3Joy1FKqJgoaoGcN3XmzDJf4KC8gMzZs3G0sULFa2DkoWrFsC3H6Ir2QlqLlu1AKalpYnmhN8FQF5IPWvURGRsDGrVdMf9mGgxSV4D7cUFKU2rhfWb89PFzcNY06kWwJSUFGbfurBw89ZtNG7YgEFHoP179hycPHECu4P/2jgrpKc4FAhO+nvhshUInD4Ntes3wNGjRwotR05djBUwXfVWLYC6puDNW7dh/LgxOH32PBrUq4vWzZszmAb6+uJfY0cXOAJSnnHxD+Dm6sKuT/SfhJEjR6JDuzaFLjR01UVXJxrzddUCaMydVpbqrmoAWzVvgUtXryjany2aNceVa1cVrYOShasaQBKeALh89erbNtbfe5/QtEv/AS6rGD4SWfUAvnfSeAGFKsABLAWAZOa8wsxzf2L73VSkZhfdq5ShmjCsji1mt3SEp4OZ3orkAOpNyuJl9CQ9B9W2xWJGSwdMa+YIO/PX7tBKYzgQrcXQ//6OhW2cMK25g16qyAHUi4zFz8RpSwz29qwCb5fXlmSNIVh8HYVM/9dOKUsaOIAlVbCE6c3WRyE7QD+dWcKqyE7e53AiDvetCt2WwnVnyQHUrdF7jSEASMdWySosWZIlDwHZ2dkwMyv8XktI814rWEDm/j8/wfquzhxAQwv/PsoTAKTzMHSo38XFBXQwbOzYscyu9tOnT5kP5qtXrzIwyZM8GQNwdnZmZ63JCDyZQSavAnQem47G3r17F5mZmQxg8jhFeZOFWjr0JVync92RkZEgh0BkSIB8OlM5lCflRacjyU63ADl5OxA8HXAA9UgCncIbN248lixdwjrVEIHK3LhxM0Z/OBKNTpixKZjs8pDHejqRGBISwqCieFQnMm1CAJK3Anpv/PDhQ1ZNwVQeOY8k2MiON9nUadSoETp06ICTJ0+CLFKsXr2aWakgqHr37s3i7tmzhxkTmDhxouhEiGz0kKUKukaerchlLkFLf0+aNEk0rcIB1BMlO7bvwIejP9RTbsXLxmnyVjz733EsMTl0pF065Bw8NTWVjUwE2dq1a9lIuGbNGgYX+XUmyxMCgBMmTGAjGJlOISu3bm5uzDYPgSyAQxsv6LD/wIEDQYZIycoFeca6c+cOc8VGwcLCgo2c5B2LRkEaccl4QIsWLRikGzZsYPE4gMXr63ypUlNfwNa2vJ5yK1429369j7p1ahUvsR5T/fbbb8ysCo2CugIHUJdCMq6Xph0opakuMqTjI6AckXTFedcevNVr1mLf7mCc/+U8hE2ouvKi6xRX2PuXlJQMR0fpg9obEbfQpFHBDhgL2w9I93eCw8eC6lGlShWQSRU5EI8fP56ZyXvbEyndb9LvZDBUjkECPgLKIUJHHDmbQAUAY2LjMGzwEJy7cA5bt+1g+wGHDhtR4MZUKvbMuQvo2L4tg5I2qNK9mvBbQdWSA6CDgwN8fHywe/du5P27cuXKqFq1KlutEqgVK1YEOfsmy7N0LymsbKnczp07sxU23T+S+RNyv0bpL1y4wPKkez9auOgKHEBdCsm4/q4Rg0bAy5cuwj8gAKOHD8MPP/+M7l27wsunF56npKBO3Xrw8urGruXdmi/siN6+K5hdyxvYLml3D2zfuYuB+XYobPQSRkByW0ErVPLbnPdvMn9HCxbyxUcA0ohIiw9ahJA1M7J2RosXCrQAIWu3lJ7csvXp04fBSyNoUZ4pcgBlACYnyv2oaNTyeONgW06C9xDnhVaL8u/pPMiNGzeYbUYyu6fPMPGnJ9jwAX8QXWJN94d+j4G+fy9xPiXJoNrYZXj0zb9LkoXB03YKeYj/86vO34ToQ/mImxHYG/I9Jk4cL7qW1Ue+heVB93xz5szF/6xeiX4/Z6B1JUus6VzxfRerl/wj/sxC670PkP6Rft5f83fBeumWkmXiERSHP9Jy0N/dBp82dUCLShYIj0/H/qgXJctYz6mPxqXh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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></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></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="reportEquals"><block var="data"/><block s="reportNewList"><list></list></block></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></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></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="reportGreaterThan"><block var="start"/><block var="end"/></block><script><block s="doSetVar"><l>step</l><l>-1</l></block><block s="doSetVar"><l>tester</l><block s="reifyReporter"><autolambda><block s="reportLessThan"><block var="i"/><block var="end"/></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="reportGreaterThan"><block var="i"/><block var="end"/></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></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 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