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At: lang power functionality 1 1 1 1

1. Alph: Type
2. L: LangOver(Alph)
3. L': LangOver(Alph)
4. n':
5. L = L'

(L0) = (L'0)

By: RecCaseSplit `lang_power`

Generated subgoals:

16. 0 = 0
= (L'0)
26. 0 = 0
((L-1)L) = (L'0)


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