A person sitting on a rock by a fall.
A person is outdoors.
sitting on a rock by a fall shows that person is outdoors
exists e1 x1 x2 x3 x4.(a_topic(x1) & by(e1,x4) & n_fall(x4) & on(e1,x3) & n_rock(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_person(x1))
exists p1 x1.(exists x2.((x1 = x2) & n_outdoors(x2)) & n_person(x1))