Three mounted police stand in the middle of a street.
The police are on motorcycles.
mounted police do not ride moorcycles
exists e1 p1 x1 x3.(n_middle(x3) & exists e2 x2 x4.(in(e2,x3) & of(x3,x4) & n_street(x4) & Actor(e2,x2) & v_stand(e2) & n_police(x2)) & Topic(e1,p1) & Actor(e1,x1) & v_mount(e1) & n_thing(x1) & card_eq_3(x1))
exists p1 x1.(n_police(x1) & exists x2.(on(x1,x2) & n_motorcycle(x2)))