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SYMPHONY requires the use of a third-party callable library to solve the LP
relaxations once they are formulated. Currently,
CPLEX 
is the only available option. Any LP solver with the appropriate
capabilities can be interfaced with SYMPHONY by writing a set of interface
routines contained in the file LP/lp_solver.c. Once the
interface routines are written, the make file must be modified
to link with the new LP solver and to set compiler directives to use
the proper interface.