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At: phole aux 2 1 2 1 2

1. n: {2...}
2. f:(n(-1+n)). i:n, j:i. f(i) = f(j)
3. f: (1+n)n
4. iii: {1..(1+n)}
5. (ii:{iii..(1+n)}, jj:ii. f(ii) = f(jj)) (i:iii, j:i. f(i) = f(j))
6. ii:{(1+iii)..(1+n)}, jj:ii. f(ii) = f(jj)
7. fi: n
8. fi = f(iii)
9. (x:iii. fi = f(x))

i:(1+iii), j:i. f(i) = f(j)

By: RWW "not_over_exists" -1

Generated subgoal:

19. x:iii. fi = f(x)
i:(1+iii), j:i. f(i) = f(j)


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