How many of the six pairs of items listed below are exact duplicates? Myron, J.T. – Mryon, J.T. Bitters M.M. – Bitters M.M. Aldrich, B.J. – Aldrich, B.J. Hoff, J.B. – Hoff, J.P. Simms, G.K. – Simms, C.K. Elvis, P.R. – Elvis, P.R.