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#7
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![]() R11
$5 tri 5//2,4,6//1,2,3,4,6=$60 $1 tri 2,4,6//5//1,2,3,4,6=$12 $3 tri 5//4//1,2,3,6=$12 $4 tri 1//5//2,3,4,6=$16 |
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