The dog walks on the high plank.
Two dogs are chasing a ball.
One dog has become two dogs and there is nothing to suggest they are chasing a ball.
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 e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & n_ball(x2) & n_dog(x1) & card_eq_2(x1))