14. Contracts not specifically enforceable .-The following contracts cannot be specifically
enforced, namely: -
(a)where a party to the contract has obtained substituted performance of contract in accordance with
the provisions of section 20; (b)a contract, the performance of which involves the performance of a continuous duty which the
court cannot supervise; (c)a contract which is so dependent on the person al qualifications of the parties that the court cannot
enforce specific performance of its material terms; and (d)a contract which is in its nature determinable .