Write each of the following statements in the symbolic form and determine which pairs (if any) are logically equivalent. Ensure that you explain the steps taken and the reason for your decision.

(i) If the goods are unsatisfactory, then your money will be refunded.

(ii) Goods satisfactory or money refunded.

(iii) If your money is not refunded, then the goods are satisfactory.

(iv) If the goods are satisfactory, then your money will not be refunded.