A person painting a railing.
A janitor paints railing in front of the school.
A person is not always a janitor. A person can paint a railing in other places that are not in front of the school.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_paint(e1) & n_railing(x3) & (x1 = x2) & n_person(x1))
exists e1 x1 x2 x3 x4 x5.(n_school(x5) & a_topic(x1) & in(e1,x4) & of(x4,x5) & n_front(x4) & Actor(e1,x3) & v_rail(e1) & (x1 = x3) & n_paint(x1) & of(x1,x2) & n_janitor(x2))