A dog chews on his red leash.
The leash is blue
The leash must be either red or blue.
exists e1 s1 x1 x2.(on(e1,x2) & n_leash(x2) & a_red(s1) & Theme(s1,x2) & of(x2,x1) & n_male(x1) & Actor(e1,x1) & v_chew(e1) & n_dog(x1))
exists s1 x1.(n_leash(x1) & Theme(s1,x1) & a_blue(s1))