A man in a jacket works atop a set of stairs.
Someone is on the stairs.
A man works atop so he should be on stairs.
exists e1 x1 x2 x3 x4.(atop(e1,x3) & of(x3,x4) & n_stair(x4) & n_set(x3) & Actor(e1,x1) & v_work(e1) & in(x1,x2) & n_jacket(x2) & n_man(x1))
exists p1 x1 x2.(n_stair(x2) & on(x1,x2) & n_person(x1))