This is as far as I've got:
xx2x x8xx xxxx
xx4A xxx6 12xx
1x59 24A7 B8xx
xx3x Axx8 7xx9
9Ax0 4675 xx12
x712 B0xx 46xx
Axx8 xx42 xxBx
2Bxx 1A8x 5x7x
0xx5 xx6x xA2x
xxAx 830x 2x6B
xxx6 97xx A5xx
xxxx 6x5A x7xx
Could someone please give me a small hint as to which box, row or column I should be looking at to find a twin or triple?