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Proof step 7 from proof perm-eq (previous step)

a × d ∈ ay ∧ unique_al(ay), unique_al(ay), perm(ay, ax), a × d ∈ ax, perm(ax, ay), unique_al(ax) ⊦ ax[a] = d

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information