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(b)
| C4 | C5 | C6 | C7 | |
|---|---|---|---|---|
| C4 | (1,1, 1,1) | (1,3/2,5/2,3) | (1/6,2/11,2/9,1/4) | (1/5,2/9,2/7,1/3) |
| C5 | (1/3,2/5,2/3,1) | (1,1, 1,1) | (1/7,2/13,2/11,1/5) | (1/6,2/11,2/9,1/4) |
| C6 | (4,9/2,11/2,6) | (5,11/2,13/2,7) | (1,1, 1,1) | (1,1, 2,2) |
| C7 | (3,7/2,9/2,5) | (4,9/2,11/2,6) | (1/2,1/2,1, 1) | (1,1, 1,1) |
