A person wearing sunglasses and a hat is walking.
A person wearing sunglasses and a black hat is walking.
A person wearing a hat doesn't imply that he is wearing a black hat.
exists e2 e1 x1 x2 x3 x4 x5.(Actor(e2,x1) & v_walk(e2) & subset_of(x5,x1) & n_hat(x5) & subset_of(x2,x1) & Theme(e1,x4) & Actor(e1,x3) & v_wear(e1) & n_sunglass(x4) & (x2 = x3) & n_person(x2))
exists e2 e1 s1 x1 x2 x3 x4 x5.(Actor(e2,x1) & v_walk(e2) & subset_of(x5,x1) & n_hat(x5) & a_black(s1) & Theme(s1,x5) & subset_of(x2,x1) & Theme(e1,x4) & Actor(e1,x3) & v_wear(e1) & n_sunglass(x4) & (x2 = x3) & n_person(x2))