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A new strongly correlated electron model is presented. This is formed by twotypes of sites: one where double occupancy is forbidden, as in the t-J model,and the other where double occupancy is allowed but vacancy is not allowed, asan inverse t-J model. The Hamiltonian shows nearest and next-to-nearestneighbour interactions and it is solved by means of a modified algebraic nestedBethe Ansatz. The number of sites where vacancy is not allowed, may be treatedas a new parameter if the model is looked at as a t-J model with impurities.The ground and excited states are described in the thermodynamic limit.Comment: Some corrections and references added. To be published in J. Phys.

Exact solution of an electron system combining two differentt-Jmodels