I am trying to figure out the question to the answer

"Was a contract formed? Is Alan's estate liable for breach of contract?"

On March 13, Alan mailed a letter to Bill in which he offers to sell to Bill his house in D.C. for $300,000 and Alan states, \"Your acceptance must be communicated to me by April I." Bill receives the offer on March 15. On March 20, Alan enters into a contract for the sale of his house with Carol for $310,\" and immediately sends Bill an email revoking his offer. This email gets lost and is never received by Bill. On March 25. Bill malls Alan a letter, properly addressed and stamped, In which he accepts the offer made on March 13. Alan dies at high noon on March 26. On March 2?, Bill's letter is delivered to A's ofce. Alan's executor (the representative of his estate) subsequently informs Bill that the estate will not sell him the house for $300,000. Bill consults you for advice. Was a contract formed? Is Alan's estate liable for breach of contract? Explain fully