[cal828]

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