A person sits on a rock at the edge of a large waterfall.
A person is near the water.
A person at the edge of a waterfall must be near the water.
exists e1 s1 x1 x2 x3 x4.(n_edge(x3) & at(e1,x3) & of(x3,x4) & n_waterfall(x4) & a_large(s1) & Theme(s1,x4) & on(e1,x2) & n_rock(x2) & Actor(e1,x1) & v_sit(e1) & n_person(x1))
exists p1 x1 x2.(n_water(x2) & near(x1,x2) & n_person(x1))