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At: lang rel symm 1 1

1. A: Type
2. L: LangOver(A)

a,b:A*. (z:A*. L(z @ a) L(z @ b)) (z:A*. L(z @ b) L(z @ a))

By: Unfold `languages` 2

Generated subgoals:

12. L: A*Prop
3. a: A*
4. b: A*
5. z:A*. L(z @ a) L(z @ b)
6. z: A*
7. L(z @ b)
L(z @ a)
22. L: A*Prop
3. a: A*
4. b: A*
5. z:A*. L(z @ a) L(z @ b)
6. z: A*
7. L(z @ a)
L(z @ b)


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