⊦ i ≠ j -1 → (i < j ↔ i < j -1)
i ≠ 13 -1, 163 % i = 0, i * i ≤ 163, 0 < i, 1 < i, i < 13 -1 ⊦ 2 ≤ i ∧ i < 10
Used terms: 13, i