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At: lang union functionality 1 1

1. Alph: Type
2. L: Alph*Prop
3. L': Alph*Prop
4. M: Alph*Prop
5. M': Alph*Prop
6. l:Alph*. L(l) L'(l)
7. l:Alph*. M(l) M'(l)
8. l: Alph*

L(l) M(l) L'(l) M'(l)

By: RWH (HypC 6) 0

Generated subgoal:

1 L'(l) M(l) L'(l) M'(l)


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