r1..3-6-1-2
r2..1-3-2-7
r3..4-5-1-7
r4..1-5-2-7
r5..7-3-2-4
r6..6-2-5-4
r7..7-8-6-4
r8..6-2-5-4
r9..6-5-1-7
r10..1-6-4-3
r11..3-8-1-2
r12..6-2-4-1

Good Luck