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At: auto2 lemma 5 1 1 1 1 1 1 2 2
1. Alph: Type
2. n:
3. n1:
4. f: n1Alph
5. Bij(n1; Alph; f)
6. f:((nn1)(n1n)). Bij(nn1; (n1n); f)
7. f1: (nn1)(n1n)
8. g: (n1n)nn1
9. InvFuns(nn1; (n1n); f1; g)

Surj((n1n); {l:(Alph*)| ||l|| = n }; z.(f o g(z))[n])
By: Analyze 0
Generated subgoal:

110. b: {l:(Alph*)| ||l|| = n }
a:(n1n). (z.(f o g(z))[n])(a) = b

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