Uniform commercial code official text and comments, including article 1 (General provisions), article 2 (sales), article 2A (leases), article 3 (negotiable instruments), article 4( bank deposits and collections), article 4A (funds transfers), article 5 (letters of credit), article 6 (bulk sales), article 7 (documents of title), article 8 (investment securities), article 9 (secured transactions)