0(3,3):  1  [C+,rn]  1  0   (*,*)  (*,*)  2  2
1(4,2):  2  [C-,i2]  0  1   (*,*)  (2,3)  2  1,2,1
2(6,0):  3  [rn,r2]  2  3   (*,*)  (1,*)  3  2,1,2,1
3(6,1):  3  [rn,r2]  3  2   (*,*)  (1,*)  3  2,1,2,1