The dog walks on the high plank.
The dog is up high on something.
Answer: If the plank that the dog is walking on is high, the dog will necessarily be high on something.
exists e1 s1 x1 x2.(n_plank(x2) & a_high(s1) & Theme(s1,x2) & n_dog(x1) & on(e1,x2) & Actor(e1,x1) & v_walk(e1))
exists s1 x1 x2.(n_dog(x1) & r_up(s1) & on(s1,x2) & n_thing(x2) & Theme(s1,x1) & a_high(s1))