Two men, one dressed in black with a white hat and the other dressed in gray sweep a set of steps.
Two men are cleaning.
Sweep is a form of cleaning, and one dressed in black and the other dressed in gray are two men.
exists e1 s1 s2 x1 x2 x3 x4 x5 x7.(-(x7 = x7) & n_dress(x7) & with(e1,x4) & all x6.(n_set(x6) -> exists s3 x8 x9.(subset_of(x7,x4) & of(x7,x9) & n_step(x9) & for(x7,x6) & in(x7,x8) & n_sweep(x8) & a_gray(s3) & Theme(s3,x8))) & subset_of(x5,x4) & n_hat(x5) & a_white(s2) & Theme(s2,x5) & Theme(e1,s1) & Theme(s1,x3) & a_black(s1) & Theme(e1,x1) & v_dress(e1) & rel(x1,x2) & n_thing(x2) & card_eq_1(x2) & n_man(x1) & card_eq_2(x1))
exists e1 x1.(Actor(e1,x1) & v_clean(e1) & n_man(x1) & card_eq_2(x1))