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#3
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R7
$2 Tri 1,2/1,2/3=$4 R8 $4 Tri 8//1,7,9//1,7,9=$24 $4 Tri 1,7,9//8//1,7,9=$24 R10 $4 Tri 6//2,3,5//2,3,5=$24 $4 Tri 2,3,5//6//2,3,5=$24 |