第一次 第二次 | A | a | B | b | D | d |
A | 无 | (a, A) | (B, A) | (b, A) | (D, A) | (d, A) |
a | (A, a) | 无 | (B, a) | (b, a) | (D, a) | (d, a) |
B | (A, B) | (a, B) | 无 | (b, B) | (D, B) | (d, B) |
b | (A, b) | (a, b) | (B, b) | 无 | (D, b) | (d, b) |
D | (A, D) | (a, D) | (B, D) | (b, D) | 无 | (d, D) |
d | (A, d) | (a, d) | (B, d) | (b, d) | (D, d) | 无 |
A. | B. | C. | D. |
A. | B. | C. | D. |
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