Someone in red stands dangerously on some railroad tracks.
A person in red sits on the railroad tracks.
A person cannot sits and stands at the same time
exists s1 x1 x2 x3 x4.(a_topic(x1) & n_dangerously(x1) & on(x1,x3) & n_track(x3) & of(x3,x4) & n_railroad(x4) & in(x1,x2) & n_stand(x2) & a_red(s1) & Theme(s1,x2) & n_person(x1))
exists e1 x1 x2 x3 x4.(n_track(x3) & of(x3,x4) & n_railroad(x4) & on(e1,x3) & Actor(e1,x1) & v_sit(e1) & in(x1,x2) & n_red(x2) & n_person(x1))