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At: lang union wf 1 1 1

1. Alph: Type
2. M: LangOver(Alph)
3. N: LangOver(Alph)

(l.M(l) N(l)) Alph*Prop

By: Unfold `languages` 2

Generated subgoal:

12. M: Alph*Prop
3. N: LangOver(Alph)
(l.M(l) N(l)) Alph*Prop


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memberfunctionlistproplambdaorapplyuniverse