At: reach lemma 1 1 2 2 1 1
1. Alph: Type
2. S: ActionSet(Alph)
3. si: S.car
4. nn: 
5. f:
nn
Alph
6. g: Alph

nn
7. Fin(S.car)
8. InvFuns(
nn; Alph; f; g)
9. 0
nn
10. s: S.car
11. mem_f(S.car;s;nil)
w:Alph*. (S:w
si) = s
By: Reduce -1
Generated subgoals:None
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