  A systematic method for generating bound entangled states in any bipartite
system, with ranks ranging from five to full rank, is presented. These states
are constructed by mixing separable states with UPB (Unextendible Product
Basis) - generated PPT bound entangled states. A subset of this class of PPT
bound entangled states, having less than full rank, is shown to satisfy the
range criterion [Phys. Lett. A, vol. 232 (1997) 333].
