A gray hair man working on a poster with foreign symbols.
A man on a building.
A man on a building and a man working on a poster are not the same.
exists e1 s1 s2 x1 x2 x3 x4 x5.(a_topic(x1) & on(e1,x4) & with(x4,x5) & n_symbol(x5) & a_foreign(s2) & Theme(s2,x5) & n_poster(x4) & Actor(e1,x3) & v_work(e1) & (x1 = x3) & n_man(x1) & of(x1,x2) & n_hair(x2) & a_gray(s1) & Theme(s1,x1))
exists x1 x2.(a_topic(x1) & on(x1,x2) & n_building(x2) & n_man(x1))