blue_sky,building,car,caterpillar_tracks,clock,clock_tower,cloud,cloudy_sky,condensation_trail,day,driving,field,flower_field,grass,ground_vehicle,hill,horizon,house,jacket,landscape,military,military_vehicle,motor_vehicle,motorcycle,mountain,mountainous_horizon,on_grass,on_ground,on_vehicle,outdoors,pants,riding,scenery,sitting,sky,sunset,tank,tire,tower,train,tree,truck,vehicle_focus,wheel,wind,windmill,rating:safe