The bike is secured to a metal post.
The bike is close to a metal post.
secured to a metal post implies it is close to a metal post.
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 s1 x1 x2 x3.(n_bike(x1) & to(s1,x2) & n_post(x2) & of(x2,x3) & n_metal(x3) & Theme(s1,x1) & a_close(s1))