0(0):   0   1     (*,*)   (2,*)     [ic,i1]   0
1(1):   1   0     (*,*)   (2,*)     [ic,i1]   0
2(2):   3   2     (*,*)   (1,0)     [C+,r1]   1
3(3):   2   3     (*,*)   (*,*)     [C-,ic]   2