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#10
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![]() R8
$2 tri 6//1,4,5,7,8//1,4,5,7,8=$40 $2 tri 1,4,5,7,8//6//1,4,5,7,8=$40 $1 tri 1,5,7//1,5,6,7//1,5,6,7=$18 |