⊦ odd(i) ↔ ¬ even(i)
⊦ (¬ even(i) ∨ ¬ even(j)) ∧ (¬ ¬ even(i) ∨ ¬ odd(j)) ↔ ¬ even(i) ∧ even(j) ∨ even(i) ∧ odd(j)
Used terms: i