In letters between the two, Rita Borelli contracted to sell "my car" to Viola Smith for $2,000. It was later shown that Borelli owned two cars. She refused to deliver either car to Smith, and Smith sued Borelli for breach of contract. Borelli raised the defense that the contract was too indefinite to be enforced because it could not be determined from the writing which car was the subject matter of the contract. Is the contract too indefinite to be enforced?