  The model of strongly correlated electrons with the correlated hopping term
and an additional interaction between holes $V$ is solved exactly in one
dimension at a special point where the number of hole pairs is conserved. As a
function of the interaction $V$ the phase diagram has a rich structure. There
exist gapless phases with dominating density-density correlations (metallic) or
pair-pair correlations (superconducting) as well insulating and phase-separated
phases. The stiffness constant of the conductivity, the effective transport
mass, and the compressibility are also exactly calculated in several regions of
the phase diagram.
