r1..5-6-1
R2..2-4-7
R3..2-1-3
R4..1-5-4
R5..5-2-3
R6..7-6-4
R7..1-2-7
R8..8-4-1
R9..5-2-4
R10..3-6-2
R11..4-1-7
R12..5-6-1

Good Luck