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## LAMA-FF synergy

If the FF heuristic should be used (for its estimates or its preferred operators) and we want to use preferred operators of the landmark count heuristic, we can exploit synergy effects by using the LAMA-FF synergy. This synergy can only be used via Predefinition (see Predefinitions), for example: "hlm,hff=lm_ff_syn(...)"

lm_ff_syn(lm_factory, admissible=false, optimal=false, alm=true, lpsolver=CPLEX, transform=no_transform(), cache_estimates=true)

*lm_factory*(LandmarkFactory):*admissible*(bool): get admissible estimate*optimal*(bool): optimal cost sharing*alm*(bool): use action landmarks*lpsolver*({CLP, CPLEX, GUROBI}): external solver that should be used to solve linear programs`CLP`: default LP solver shipped with the COIN library`CPLEX`: commercial solver by IBM`GUROBI`: commercial solver

*transform*(AbstractTask): Optional task transformation for the heuristic. Currently, adapt_costs() and no_transform() are available.*cache_estimates*(bool): cache heuristic estimates

**Note:** to use an LP solver, you must build the planner with LP support. See LPBuildInstructions.