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It is shown that three or more dark/gray solitons can form bound states innonlocal media. More over dark/gray solitons can form bound states in severalbalance distances. Numerical simulations indicate that some of such boundstates are unstable and will decay into a group of fundamental solitons, whileothers may be stable. There exist degenerate bound states with the samevelocity, Hamiltonian, particle numbers and momentum but decaying in differentways and having different lifetimes.

Bound states of spatial optical dark/gray solitons in nonlocal media