12. Consider the following sequence of events: i. On August 1,Anahid (who is not a merchant) mailed Raul a valid offer. The offer contained the words, "This offer shall be held open until August 7".
ii. On August 2, Raul received the offer.
iii. On August 3, Anahid mailed a revocation of her offer to Raul.
iv. On August 4, Raul received the revocation.
v. On August 5, Raul mailed an acceptance of Anahid's offer to Anahid.
vi. On August 8, Anahid received the acceptance.
Under these facts, when was a contract formed, if at all?