Three workers in fluorescent orange clothing cleaning the subway tracks.
Two workers are painting graffiti all over the walls of a subway station.
Workers who are cleaning the subway tracks would not be painting graffiti on the walls.
exists e1 s1 x1 x2 x3 x4 x5 x6.(n_track(x5) & of(x5,x6) & n_subway(x6) & a_topic(x1) & in(x1,x2) & Theme(e1,x5) & Actor(e1,x4) & v_clean(e1) & (x2 = x4) & n_clothing(x2) & of(x2,x3) & n_orange(x3) & a_fluorescent(s1) & Theme(s1,x2) & n_worker(x1) & card_eq_3(x1))
exists e1 x1 x2 x3 x4 x5.(n_wall(x3) & r_all(e1) & over(e1,x3) & of(x3,x4) & n_station(x4) & of(x4,x5) & n_subway(x5) & Theme(e1,x2) & Actor(e1,x1) & v_paint(e1) & n_graffitus(x2) & n_worker(x1) & card_eq_2(x1))