6: Revocation how made

A proposal is revoked— (1) by the communication of notice of revocation by the proposer to the other party ; (2) by the lapse of the time prescribed in such proposal for its acceptance, or, if no time is so prescribed, by the lapse of a reasonable time, without communication of the acceptance ; (3) by the failure of the acceptor to fulfill a condition precedent to acceptance; or (4) by the death or insanity of the proposer, if the fact of his death or insanity comes to the knowledge of the acceptor before acceptance.

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