Two guys, one wearing gray and one wearing black, sweep of a set of stairs.
Two guys are sweeping stairs in the Sears tower.
Not all stairs are located in the Sears tower.
exists e1 s1 s2 x1 x2 x3 x4 x5 x6.(a_topic(x1) & rel(x1,x2) & rel(x2,x4) & of(x4,x5) & of(x5,x6) & n_stair(x6) & n_set(x5) & n_sweep(x4) & Theme(s2,x3) & a_black(s2) & (x2 = x3) & n_wear(x2) & card_eq_1(x2) & card_eq_1(x2) & a_gray(s1) & Theme(s1,x2) & Actor(e1,x2) & v_wear(e1) & n_guy(x1) & card_eq_2(x1))
exists p1 x1 x3 x4.(n_tower(x3) & (x3 = x4) & ne_geo_sears(x4) & exists s1 x2.((x1 = x2) & in(x2,x3) & n_stair(x2) & a_sweeping(s1) & Theme(s1,x2)) & n_guy(x1) & card_eq_2(x1))