9.
11.
13.
15.
17.
19.
21.
23.
25. None
27. (0, 0), (1, 0), (0, 1), (1, 1)
29. (2, 0), (3, 1), (2, 2)
31.
33.
35. Inconsistent.
37.
39.
41.
43.
45.
47. A
49. B
51. E
53.
55.
57.
59.
61.
63.
65.
67. D, K
69. E, L
71. E, B
73.
75.
77.
79.
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