0(0,6):  0  0  [i1,ic]  1  0   (2,*)  (*,*)   
1(1,6):  0  0  [i1,ic]  0  1   (2,*)  (*,*)   
2(2,5):  1  1  [r1,C+]  2  3   (0,1)  (*,*)   1
3(3,2):  2  1  [ic,C-]  3  2   (*,*)  (*,*)   2,1,2