Title Two Nearly Isomorphic Groups Author Dimitri Leemans Reference Atti Sem. Mat. Fis. Univ. Modena, XLV(1997), 373-376. Math. Reviews 98k:20005 Zentralblatt 893.20001 Abstract While exploring Sims' list of primitive permutation groups of degree less than 50, we met two groups of degree 49, called P49N15 and P49N16, which have isomorphic posets of conjugacy classes of subgroups and for each normal subgroup N of the first, there is a normal subgroup isomorphic to N in the second group such that the quotients by N are isomorphic.