matters is a mean of machine for smoothing heating
perpetual_motion_machine is machine. cooking is heating. heating_room is not used_cooking_meats_or_drying_paints. heating_element is heating_device. heating_room is used_cooking_meats_or_drying_paints. heating_pad is not heater. heating_element is not heating_device. overheating is heating. overheating is not heating. heating_pad is heater.