A number of people cross in front of the top of an escalator.
The people pass by the stairs.
cross and pass are different actions
exists e1 x1 x2 x3 x4 x5.(n_top(x4) & in(e1,x3) & of(x3,x4) & of(x4,x5) & n_escalator(x5) & n_front(x3) & Actor(e1,x1) & v_cross(e1) & of(x1,x2) & n_people(x2) & n_number(x1))
exists e1 x1 x2.(n_stair(x2) & n_people(x1) & by(e1,x2) & Actor(e1,x1) & v_pass(e1))