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conventional boiler (subgroup of boiler) → ReceivesAction → expensive to install	0.42
gas furnace (subgroup of furnace) → ReceivesAction → expensive to install	0.25
geothermal heat pump (subgroup of heat pump) → ReceivesAction → expensive to install	0.25
fire sprinkler (subgroup of sprinkler) → ReceivesAction → expensive to install	0.16