R1...2-7-5-6-8
R2...6-2-4
R3...2-5-6
R4...3-7-5
R5...9-2-3
R6...7-5-4-8-2
R7...11-12-10
R8...1-4-8-5-6
R9...10-2-1
R10..8-2-1-9-7
R11..1-4-8
R2...6-2-4
R3...2-5-6
R4...3-7-5
R5...9-2-3
R6...7-5-4-8-2
R7...11-12-10
R8...1-4-8-5-6
R9...10-2-1
R10..8-2-1-9-7
R11..1-4-8