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At: lang union wf 1 1 1 1
1. Alph: Type
2. M: Alph*Prop
3. N: LangOver(Alph)

(l.M(l) N(l)) Alph*Prop
By: Unfold `languages` 3
Generated subgoal:

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

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memberfunctionlistproplambdaorapplyuniverse