A rock climber ascends.
A rock climber is riding an elevator.
He could ascend without riding an elevator.
exists e1 x1 x2.(Actor(e1,x1) & v_ascend(e1) & n_climber(x1) & of(x1,x2) & n_rock(x2))
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & n_elevator(x3) & n_climber(x1) & of(x1,x2) & n_rock(x2))