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Proof step 11 from proof prime-product (previous step)

⊦ ∃ ints0, ints1. perm(ints, ints0 + ints1) ∧ (ints0 = [] ∨ max(ints0) ≤ j) ∧ (ints1 = [] ∨ j < min(ints1))

A spec-lemma