C2=1 r9=8

C1=9 r1=2

C9=2 r8=9

C2=8 r2=1

C8=1 ...

C4+1 r2+2

C4+3 r4+3

C4-5 r2-5

C4+2 r4+2

C4+3 ....

C4+1 r2-3

C2-1 r4-4

C4+2 r4+2

C2+2 r4+2

C2+3 r2+3

C4-4 r4-4

C2-3 r2-3

C4+4 r4+4

C2+3 ....

Explanation: