 | |||
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. 2 X U :
X = (1, 7)
U = ((1,1),(1,2)(4, 5), (5, 6))
 | |||
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:
X = (1, 7)
U = ((1,2),(1,3), (3, 2), (3, 3), (3, 4))
 | |||
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