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At: lpower alt 1 2 2 1 1 1 2

1. Alph: Type
2. L: Alph*
3. n:
4. 0 < n
5. (Ln-1) = if n-1=0 nil else L @ (Ln-1-1) fi
6. n = 0
7. n-1 = 0
8. n = 0

((Ln-1) @ L) = L

By: RecCaseSplit `lpower`

Generated subgoals:

19. n-1 = 0
L = L
29. n-1 = 0
(((Ln-1-1) @ L) @ L) = L


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