A group of construction workers going down a flight of stairs.
Men and women walked down the stairs.
The group of constructions workers doesn't necessarily consist of both men and women.
exists e1 s1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & a_down(s1) & Manner(e1,s1) & Theme(e1,x5) & Actor(e1,x4) & v_go(e1) & of(x5,x6) & n_stair(x6) & n_flight(x5) & (x1 = x4) & of(x1,x2) & n_worker(x2) & of(x2,x3) & n_construction(x3) & n_group(x1))
exists e1 x1 x2 x3 x4.(n_stair(x4) & down(e1,x4) & Actor(e1,x1) & v_walk(e1) & subset_of(x3,x1) & n_woman(x3) & subset_of(x2,x1) & n_man(x2))