We need to add all the necessary test cases to validate the following rules: - ¬ (¬ e1 ∧ ¬ e2) ===> (e1 ∨ e2) - ¬ (¬ e1 ∨ ¬ e2) ===> (e1 ∧ e2) --- **Transferred from:** input-output-hk/sc-fvt#420