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