A person with black hair and a blue uniform is standing on the sidewalk.
A person with black skin, black hair, and in a blue uniform is standing on the sidewalk.
Just because the person has black hair does not necessarily mean that the person has black skin.
exists e1 s1 s2 x1 x2 x3 x4 x5.(n_sidewalk(x5) & on(e1,x5) & Actor(e1,x1) & v_stand(e1) & with(x1,x2) & subset_of(x4,x2) & n_uniform(x4) & a_blue(s2) & Theme(s2,x4) & subset_of(x3,x2) & n_hair(x3) & a_black(s1) & Theme(s1,x3) & n_person(x1))
exists e1 e2 s1 s2 s3 x1 x2 x3 x4 x5 x6 x7.(n_sidewalk(x7) & n_sidewalk(x4) & on(e2,x7) & Actor(e2,x5) & v_stand(e2) & in(x5,x6) & n_uniform(x6) & a_blue(s3) & Theme(s3,x6) & n_person(x5) & on(e1,x4) & Actor(e1,x1) & v_stand(e1) & with(x1,x2) & rel(x2,x3) & n_hair(x3) & a_black(s2) & Theme(s2,x3) & n_skin(x2) & a_black(s1) & Theme(s1,x2) & n_person(x1))