rarefaction power mass blood and device
rarefaction is concentration. high_explosive is weapon_of_mass_destruction. high_explosive is not weapon_of_mass_destruction. power_strip is single_purpose_device. mass_defect is mass. weapon_of_mass_destruction is lethal_weapon. rarefaction is not concentration. mass_defect is not mass. medium_range_rocket is generic_artifact. shock is mass.