The bike is secured to a metal post.
The bike has two wheels.
he bike has two wheels is not necessarily to be secured.
exists e1 x1 x2 x3.(n_bike(x1) & to(e1,x2) & n_post(x2) & of(x2,x3) & n_metal(x3) & Theme(e1,x1) & v_secure(e1))
exists e1 x1 x2.(n_bike(x1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_wheel(x2) & card_eq_2(x2))