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R9
$1 Tri 6//1,3,4,5,7//1,3,4,5,7=$20 $3 Tri 6,7//6,7//1,3,4,5=$24 $6 Tri 6//1,7//1,7=$12 R12 $1 Tri 11//2,3,7,9//2,3,7,9=$12 $1 Tri 2,3,7,9//11//2,3,7,9=$12 $2 Tri 2,11//2,11//1,3,7,9,10=$20 |