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Proof step 23 from proof in-mkbag-del-two (previous step)

m1 < i, m < i, m0 < i, i ≤ # A, m ≠ m1, m0 ≠ m1, m ≠ m0, A[m] = a, A[m0] = a, A[m1] = a ⊦ count(a, mkbag(A, i)) > 2

Lemma count-mkbag-greater-two