premise: Three men wearing orange and green cleaning uniforms sit on a bench behind their cleaning carts which have their broom handles showing. hypothesis: The three cleaners are mopping the cafeteria.
contradiction: When people sit on a bench next to their carts that have their broom handles showing, they are resting and their brooms are not currently sweeping the floor, while those mopping the cafeteria are actively working, and using mops rather than brooms.