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At: fun enumer 1 2 1 2 2 1 2 1 1 2 1

1. n:
2. m:
3. 0 < m
4. f: ((m-1)n)(nm-1)
5. Bij((m-1)n; (nm-1); f)
6. n = 0
7. f1: n(nm-1)(nm)
8. Bij(n(nm-1); (n(nm-1)); f1)
9. b: (nm)

a:(mn). (z.f1( < z(m-1),f(z) > ))(a) = b

By: Reduce 0

Generated subgoal:

1 a:(mn). f1( < a(m-1),f(a) > ) = b


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