An old man is standing in front of an ad on the sidewalk.
An old grey haired man is standing in front of an ad on the sidewalk.
Being grey haired isn't always a trait old people have.
exists e1 s1 x1 x2 x3 x4.(n_sidewalk(x4) & on(e1,x4) & in(e1,x2) & of(x2,x3) & n_ad(x3) & n_front(x2) & Actor(e1,x1) & v_stand(e1) & n_man(x1) & a_old(s1) & Theme(s1,x1))
exists e2 e1 s1 x1 x2 x3 x4 x5.(n_sidewalk(x5) & on(e2,x5) & in(e2,x3) & of(x3,x4) & n_ad(x4) & n_front(x3) & Actor(e2,x1) & v_stand(e2) & n_man(x1) & Theme(e1,x1) & v_hair(e1) & of(x1,x2) & n_grey(x2) & a_old(s1) & Theme(s1,x1))