A person rappels off a cliff face.
Someone is climbing on a cliff.
If a person rappels, it is a good indication they are climbing.
exists e1 s1 x1 x2 x3.(a_off(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_rappel(e1) & n_face(x2) & of(x2,x3) & n_cliff(x3) & n_person(x1))
exists e1 x1 x2.(on(e1,x2) & n_cliff(x2) & Actor(e1,x1) & v_climb(e1) & n_person(x1))