  We comment on the Reply of G. Su and M. Suzuki [cond-mat/9808011] to our
Comment [cond-mat/9807402] about the papers of G. Su [Phys. Rev. B 54, 8291
(1996)] and G. Su and M. Suzuki [Phys. Rev. B 57, 13367 (1998)]. The algebraic
mistake originating their incorrect solutions is evidenced in detail.
