the circulatory screws airports bone throughout the mind
cystic_duct is anatomical_vessel. cystic_duct is not anatomical_vessel. screw is not inclined_plane. machine_screw is not screw. phillips_screwdriver has not crossed_head machine_screw is screw. cerebral_aqueduct is duct. metal_screw is screw. cerebral_aqueduct is not duct.