A guy with a uniform on walking in the street.
there is a man walking
Guy and man are interchangeable.
exists x1 x2 x3 x4.(n_street(x4) & a_topic(x1) & in(x1,x4) & with(x1,x2) & on(x2,x3) & n_walking(x3) & n_uniform(x2) & n_guy(x1))
exists p1 x1 x2 x3.((x1 = x2) & n_walking(x2) & of(x2,x3) & n_man(x3))