On January 1, Seller sent a letter to Buyer offering to sell to Buyer 5,000 widgets for $25 apiece. The letter also stated: “This offer is binding and irrevocable until February 1.” On January 5, prior to Buyer’s receipt of the letter, Seller called Buyer on the telephone and left the following message on the answering machine at Buyer’s place of business: “Ignore my letter of January mju6