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At: append commutes under sublist

T:Type. Discrete{T} (eq:{T}, L,M:T List. (L @ M)(eq)(M @ L))
By: UnivCD
Generated subgoal:

11. T: Type
2. Discrete{T}
3. eq: {T}
4. L: T List
5. M: T List
(L @ M)(eq)(M @ L)

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