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At: lang auto lem 1 1 2 1

1. Alph: Type
2. L: LangOver(Alph)
3. EquivRel x,y:Alph*. x L-induced Equiv y
4. L Alph*Prop
5. g: (x,y:Alph*//(x L-induced Equiv y))
6. l:Alph*. L(l) g(l)

LangOf(A(g)) = L

By: Unfold `lang_eq` 0

Generated subgoal:

1 l:Alph*. LangOf(A(g))(l) L(l)


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