A1: -1
B1: 0
C1: 2
A2: 0
B2: 5
C2: -6
A3: 4
B3: -5
C3: 7
A6: 2
B6: -5
C6: 0
A7: 4
B7: -10
C7: -8
A8: 6
B8: -15
C8: 1
A: {{A1, B1, C1}, {A2, B2, C2}, {A3, B3, C3}}
B: {{A6, B6, C6}, {A7, B7, C7}, {A8, B8, C8}}
C: {{A6, B6}, {A7, B7}, {A8, B8}}