A person standing on a ridge in the desert.
The person is down in a canyon.
Is the person on a ridge or in a canyon.
exists e1 x1 x2 x3 x4.(n_desert(x4) & a_topic(x1) & in(e1,x4) & on(e1,x3) & n_ridge(x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_person(x1))
exists s1 x1 x2.(n_person(x1) & in(s1,x2) & n_canyon(x2) & Theme(s1,x1) & a_down(s1))