sentences: rarefaction power mass blood and device
docs: massing_combat_power is physical_collecting_event. nbc_weapon is weapon_of_mass_destruction. medium_range_rocket is generic_artifact. high_explosive is weapon_of_mass_destruction. mpf_activity_in_prophase is mass_mpf_activity. rarefaction is concentration. mass_defect is mass. shock is mass. weapon_of_mass_destruction is lethal_weapon. power_strip is single_purpose_device.