<snapdata remixID="12259561"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 8.1, https://snap.berkeley.edu" version="2"><notes></notes><thumbnail>data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAKAAAAB4CAYAAAB1ovlvAAAAAXNSR0IArs4c6QAAFPpJREFUeF7tnQlUVEfWx//stLigBFEQMSAIqGyConGLE8EtxkRjzOgkEzUmk5jMSWb8sn6JybhkmzEz6mTUSSbLJCYGFFEQURHQqEFBRGURF9ZGUNmavWmYc8u8noZezxmbB/3qntOH03T1q6p7f31fvapbt6w6Ozs7wYVrQCQNWHEARdI8r5ZpgAPIQRBVAxxAUdXPK+cAcgZE1QAHUFT188p1AtjS0oKcnBzU1NSIoqFBgwZhxIgR7MXFsjWgE8CffvpJbfyDBw9i7NixqKysRGRkpF5t5ObmIjAwsMvntbW1OHbsGBYvXtzl/x0dHbC2tjao2du3b8PDwwPDhg2zbAtIvHdaAMrlcrS1tanV8swzz2DFihW4du0a3Nzc2GcDBw4EwaVSqSCTydDc3Iz7778fN27cgKOjI8iDOjg4MGhfeOEFENCXL1/Gfffdx8pdvXoVjz/+uFHV03UDAgKMluMF+q4GtAA8deoU3N3dQfPTVlZW2L59O/r37896OHz4cJw5cwaenp4gj+fq6so8GcE4depUBh69LywsRHV1NfOira2tsLOzw4ULF1j5rVu3YsuWLVi5ciW7vlCPrr+DBw+Gs7Nz39Uub7lRDegEUPO2Rx7N1taWeTsS8oD9+vVDZmYmIiIiGFhBQUFQKpXqygoKChhYXl5eDCCFQgEnJye1Z7WxsUFjY6PRxhGA9OJiuRrQApBul+TpSAi+nLREKOSFPaKBYWPC4BEYoa6LA9gjahe1Ep0ACh6QALi6biy8hw7AFd/lUHjofwj5X3oxoPwM/Aq/hWNHC1rWZaGuro5dbsiQIdwD/i+K7QPf1QLw5MmT6idPAqDyrXG4Nf0NeE1ZeNcr2tsjdfPLUFaVGO2e38z5cJv7NLt9C+M9uv3qkuJT8QjL/hhtr2Wz8aMAILWBi+VqQCeA9LQrAHDpvSh4vRqL+Ph4LFy4ENlnTsLnm5fgYGNlklYct2WzhxMCj6Zf6IFEn6j+uRTOrxxSA+ji4sK8IBfL1YBOAIcOHcp6TAAc2rQaD6z9C3744Qc88cQTyDyZisia80C1HHaunmgrzoOt6wg4eAWg5VoOOtvb4OAViOqYLewaDlvPsydhApA8oSEAi7/5P4x/8R+4c+eOun5qAxfL1YAWgCdOnEAXADc/iwde/DPWrFmDVatWwVbZjODUv6L/mDA4z1+NtrJCWDv2g+rOTXSolGi/WcSAvLP7Q6Y1+79lga5pb2+PkJAQgwCWEIBrd4AmoUlo3pADaLnwUc90AkjzdQIAieQBX/yzWgvZp0/A//tXYGdt/BZsLXOC9eY0tLe3Mw9If2lKR5+U/Ps15gE1ASQIuViuBrQATE9PZxPGAoCHNj+Lyb/7WK0BaysruNXeQGthllGtqAIeQJ2TGxoaGu56Q3t79tInZd++zjzgrVu3WBFqBwfQqJr7dAGdAApGJwDIA2oC2NxQj/yXZ8FNZngtl7RCzymB311FXn4+A4+W1oQ5Rl1aK/v2DYxf+48uAAo/hj6tZd54vRrQAjAtLU3tdcj45AEjn/+IBRXQ+47GOkRcjkFHSR46mhV6Lzxw1pOoT9kN5125KC0rZysi9HBBkS76pPw7AnAHqqqqWBEai3IALZtenQAKA38CgDwgAXjx4kWEh4fj59SjiCw9DpmrO2T+E9FyLRsDJi9AU84J9I+cB1VDHRTpMbAdPAx3vv8Ig3ZeRlm5HF9//TWWL1/OAhn0A/gm84CaAAoPRJZtBun2TgvA1NRU9ZMnGZ884KTnPmSRLjQnV5R3ERPO7EI/9/thZe+IlvwMOPgEM89o5+YFKwcZ2qsr0NHciOZLPzEAyQNSgEN5ebk6sEGXyst3v4mgtTtYFA0JzUdyAC0bTqMAkgckAAWpKLkB9+2/YeM7U2Tw5wWg4ARhDGjolirf/VYXD8gBNEXDfbuMFoDHjx9nHpCiWWhNOHHjKkzUAJCiWgrSk9Bed3euzpB4R0xHxwAX1NfXs2IUI0gvfSL//i21BxTqF1ZljNXFP++bGtAJoLD8RcYnDzhxzQfq3pVdu4LBn62Cs71xF0jzgMp3D7O5P5oHpCU5Q/vgK75/m3lA4RZMPwAOYN8Ey9RWawGYkpKiXn8lABLIA675gK3jUuwfWwnZ9zqcRo6B/Uh/QKWESlGD/pEL2FNx08WTbOwnSPsHJ9UA0jSMQQB/eJt5wJs3b7KvU/08JN9UU/bNcjoBFIJA2S1402qEr97EIp337NkDfy8PhMS9AefIeUCHCrC2hlPog+js6ERHQw06O1So/uETtTaUm0+w8CryqhS0agjAmwTgSztRUVHBvk9zhhzAvgmWqa3WApDm+wQACQDygAKAFKCakXYMofvfhJOnLzrblYCVFexH+AKdnehobQbQiebLp9l7ktaNaWzcR7fgpqYmdWS1rgZW7nkHQS/t6AKgoYlrUzvJy/VeDegEUNiHQcYnDzhh1UZ1DxrqauEvz4AJS8HocPVCmcsYFgsoiCEPWPUjAbgTtDGKhKZuOIC9F5570TKdAAqrFQQAeUBNAAc7D0LGp6+bFJDqM20OHCY/wjwgQUj7SWgsqU+qfnyXeUBNAKkNXCxXAzoBFFYryPjkAcNWbkB2djYLpyq4kInxsa+ZHJDa9H4K28REt2AKSqCIGL0AxryL4Jd2sglrEtoXzAG0XPioZ1oAHj16VL1cRgCQByQAS0pK2Mb0owf2YcKBt+G66HcsGNXRPwKqmkrYDLoPqrrbsBkwBLVJX7KVEZLG946xHXECgJq757qr9lbMeuYBNQGkNnCxXA3oBHDAgAFqD5S4aRWGz12LI0eOYMaMGWi8fZMBeP/GONQm/BPOC9ag+fIpyMZOYX9pOU5ZWawOSCUAL126xFZCxowZ02X7phaAseuZBywrK2Mf0b5iDqDlwqfTAxJoAoAEAHnA0Gf+pNZCQXYmwuLfVAekOvqGsfXfzpZGWDk6dZkDpIno2nX7mEclD0j7gzWzLnRX7e3Y95gH1ASQ54eRKID0tEoZEBI2rESIBoAEkj+q0Vp43qhm+k9egIu3GtHc0srK0nf17Yqjz2/vfU/tAYX6OYBG1dynC2jdgpOTk9URKwzAjasQ8tv3/9vJdiWKX59vUkAqfWmIXzBUqz9lc4C0IUnYoqlLa3f2kgfcidLSUvYx1U8vLparAeMAbliJ4N++D3o4ofwvxfmXEJHwTpc9IfYeo2Fl5wAbZ1c0ZadqaUv14U9s7EcPI3QbpiU5nQDue595QA6g5QLXvWdaAB4+fFjLAwY9tR6xsbFsSsSlnz0earoMe1k/2A4ZBuWtMtgNHYmmC2lw9AvDwAeXQVVbBVuX4Sh7exHaaypBAFJAK03BUAo3fXlhauL+1MUDjhw50uwekDbBU56bEZ6ecDCwX+VeIkF6KC0tQ0CAv+SnmXQCSJ6KhAA4uGElCEBKWDl+/HgU5mRhWu4eyFzcYG0vg6q5AR2KaihvlTLobAa5wmagC9qrStF6PQedqnZQQAIpncZzxcXFBgDcgOCXd7IpH6F+aoO5hPpUUlKKqKjZBjdLmaN+mpBPSjoMT88RTK9SFS0Ak5KS2K1SAIDGgON/865aP7VVFRj95fMmB6Q6jA5F1ZMfsKdfGgMSiEKmre5Kr92/gXlAAUDKrmUuAGlIEL8/HouXdE2e2dMg7N27F48++miX5cqeboOY9ekEkFYuSAgA8oCaANL/KUaPAhNMEbrF0bjPFKndv5F5QPKSQv3UBnPI6VOnMdzdHaNGmef6prY5NzcPSmUbgoODTf2KRZXTAvDQoUNs6UwAIGHjSoxb8V8PaM7e18UTgLtQVFTEqhk1ahT7EZhD9sbEYOGiRXo3yl+/dp2tSU+dNpV5b0rcOXPmTKQcS0F4RAQGDrw7WU/v21UqtmHL1tbG4KYrXf0gT3wgPh6PdUtjbI4+98Zr6gSQ0u4KAJAHHLfinR5pe138JuYBNQEkCM0hMXv2YMnSpXovXS6XY9u2v+PZZ1ehIL+ATY77+fnhZHo6Vj/3HNyG3t28f6WwEE1NzaiQy9nYliA9e/YsBjk7o7ysFA0NjZg1axa8vPSPZY21xRz97y3X1AIwMTGR5X0WAKSJ6LFmAvCrr74Cvej2Q2l76w8QgLvYDjwSyidtLgATDhzEjAdn6t2l9/FHH7PponpFA/x8fXGn+g48PUci99JFPLn81+oHh+++283KzfrVLCQkJGKMnx8+37ULEydFwpoCMJqaEBochPnz5+m0eXNLC5KTkvDIokW9hYkebYdOAIXxHQFAHnDs8v9nE8mU5epep8ylaZ/o6Gi2cb3km9eYB9QEkNpgDpGXy1F49SpmzJhujsubfM2MjLOgEDdfPz+Tv2NJBXUCKOxcI+OTB3Sf/xLrM60R5+fns2MbhKTiND6iQAPhvaAcek/THMLgmt4TbHPmzGFFNMsTfJQ53+HMLuYBr1+/zsp4e3szL2guiYmJwSID40Bz1Stcl2YEYmJisWzZE+auqtdeXwvAhIQE9dZJAoA8YKNvNMuET5EpPj4+XbZWUkZ8Cjal8Q8lFRo9ejSDKy8vj4H00EMPMa9JDzYEJHk7IVkRaYU+o33DFCkjeEBNAKkN5pLamlrQtJO3jw/7Udna6c/cdS/b0NrSivNZWai6dQuzZz8k6ZMAdAIoZLAi41/98GGc934KUVFR7MyOuLi4Ljn7hH3E9J1z585h3rx5oDS/wrkhoaGh7MQlWgEh0MiLCnN7tFFJgI9ADsrcDNkLcexMEhKC3ZwAClBduXIFBXn5BkPF7iWAjjJHhISEwt2DR3vrXAsW9nCQ8ds+mYZMr1+jtNOF/VJpfKgZpUxniFAIP+VzoSkFKkOQkZejMSOVp43pdLuhrFs0YCdvSZvfBfjorwfuIDznE1SuOa6+BdMUDD15crFcDWgBSLdaigkkqMgDEYAuA2RI7T8L5QO6HsV1r9TiocjFzIYU9LNSMgAFD0hbQekWzsVyNaAFIHWV9v9SECntfAtXXkR/h54ZG9H6aIYsgnlJ2pz+9NNPW67mec+YBnQCSB9kZGSwNWFDuVzMoUNaJ6a14NmzZ5vj8vyavUwDegHsZe3kzbFQDXAALdSwfaVbkgeQjpCgtVxFfT1UKv17lu+lQWmJzsmpPxwdHdg6sZRF0gAePpwMHx9vNnkuhly/foM98dNktFRFsgBSwvRz5zIRHR0lqu0p+GPG9Olw+uVMZlEbI0LlkgUw+XAyi+sbMkTc84jlFTdxpSCfhXFJUSQLYMyPP2LxkiVaofDp6SdQVVmFiIhw0JEVTz39lElcpKQch7v7cPj7++NsxlmEhoV2CXbNzMzChAlhWteidfPYmBgsefxxk+qxtEIcQI3UcTQHGRu7F0uX3oXh2NFjGO3ri3V/+CMiJk3EKC8vJCYkYv176/HVN//GgnlzEfYLVEeOHEVQcDDalUps37oNmz7YhC+++Beys7Lw4tq1+PLLL/H888/Dq9sWAA6goYR9lvZz0+hPWmoq/Pz9MXzYsC69TE1NY0/E4RHh+PnMGQQEjkVJSTG8vX1Y0qSqykoEjh2Ly5cvISo6GoN+OfeEPKC1tRVsbGxRXHQD4eERcHB0wMWcHMyOjkZaahpbJ4+MnNSlvurqGpw7m8GuJUWRrAekYIm09HTMn6c7UrmnYKAn8fDwCZI9FVSyABJgFHTh6+trtrB/YxDTFAwF4lKMpFRF0gCS0WlXG+3LaGpsRAclXe8Bods0hazJ+skwfbq4WwJ6oLsGq5A8gGIbQOr1cwClToDI/ecAimwAqVfPAZQ6ASL3nwMosgGkXj0HUOoEiNx/DiCAohtFOJ6SAoXi7rGy5haZrB8mRk6SbEYsTf1KGkDaAXj06DG2CkH7l2lerieEsknQ0RUE/ty5c/jG9J5Qem+sY/fu77FkyRLY9VBGhO46UCrbsX//fiwROUmmmLaRrAekTAw1NbWYODFCTP0jLS0dvr6jJZsrWrIA7o+LQ1T0HMhkpmV6NZVSyvfSUK+At49pOW0Uigakp6Zi/sMLTK3CospJFkBTk0IqGhqw47MdCA0NgefIkSgrLcUD06biYHw8ZkdFISvrPJqbmliIVs6FbERMmoS/bfkUq9esgbe3aZm9TG2LRZH3S2ckC+De2Fg8vPARo+M/ymtzKDEJbco2UOyep6cHBg8ewvIl1tfWwt5Rhqjo2Th4MAFhoaFoaWlB1rlzcPPwwLw5xqNcKGcOeWOKzpaiSBbAC9kXYOdgj8CAAIN2JwApeDUgMJAlX6Lc0eODgpCXmwvK7kXBql5eozDcwx3ZWecRHBKCigo5FPUKljXVmBQVl0BeXoYpU6YYK2qRn0sWQMpDE7cvDo8tfkxUw9IBQAsXLmRHWEhRJAsgGZsSZsrlFeygGsrE1ZNC3jQ5+Qg7qCYoKKgnq+5VdUkaQLIE7fO4cqWQneJkY9MzENL8HyVgCgsLlWwovvArkDyAvcodSLAxHEAJGr03dZkD2JusIcG2cAAlaPTe1GUOYG+yhgTbwgGUoNF7U5clDyA/MV1cHCUNID8xXVz4qHbJAshPTBcfPkkDyE9M5wCKqoHuJ6ZTIOmJtDRMnDQJnp6erG2UvJzOvaO1YkEoJEvfyejCNcaNG49Bg50xzM3NaB/5iekSzQ/YPQiU0rUdTkqClY0tXF1dWbKiKQ9MwenTPyNq9q9ACSgpgoZemiejD3FxwSSNsP7DyUcwffo0/OvzLxA9J5qF/TcoFGhqboa8vBwjPD0xp1ucIA9INfo7tbwC3U9MLy0tw2fbtiFi8mTkZGejuKgIa3//exb5vHjJYmz5yxbY2tjg1XXrkJyc3OVk9Ff/8ApTEHnAz7b/HcuWLUNuXh77X01NNY4lH8G44BCUFBcjJCwUK1c+Azvbu8ef8RPTJeoB+YnpvcOpSPYpmNTPT0wXH0JJA8hPTOcAiq8BAHRien5eXs+dmO4oY5kY+InpEp6I7hXk80ZIdyWE2753aEDSY8DeYQJpt4IDKG37i957DqDoJpB2AziA0ra/6L3nAIpuAmk3gAMobfuL3nsOoOgmkHYDOIDStr/ovecAim4CaTeAAyht+4veew6g6CaQdgM4gNK2v+i95wCKbgJpN4ADKG37i957DqDoJpB2AziA0ra/6L3nAIpuAmk3gAMobfuL3nsOoOgmkHYD/gPalFgverERcgAAAABJRU5ErkJggg==</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></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 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