Not all illegal agreements are valid, but not all non-agreements are illegal. Agreements related to an illegal agreement are not concluded. The classic example is the illegal agreement of a rental murder. Since murder is illegal, two parties cannot enter into a contract to kill. If he has not paid his fees, a hitman cannot go to court and sue the other party for breach of contract, because the contract is illegal and not aerated. Some illegal agreements, including murder for example, are in themselves crimes. The seriousness of the illegality plays a role, as well as the knowledge of the parties when the contract was concluded. Unlike an illegal agreement, an unensed agreement can be defined as an agreement that is not legally binding. Such agreements are not applicable in the eyes of the law, as they do not bind the parties by rights or obligations. No transaction carried out under a void agreement shall be considered valid and effective. Agreements can be either annigable from the outset, that is.