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At: lang power functionality 1 1 1 2

1. Alph: Type
2. L: LangOver(Alph)
3. L': LangOver(Alph)
4. n':
5. L = L'
6. n:
7. 0 < n
8. (Ln-1) = (L'n-1)

(Ln) = (L'n)

By: RW (RecUnfoldC `lang_power`) 0

Generated subgoal:

1 if n=0 else ((Ln-1)L) fi = if n=0 else ((L'n-1)L') fi


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