Workers in orange vest painting an underground railway.
Nobody has a vest.
The workers can either have  orange vest or they do not have vest at the same time.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & in(x1,x2) & Theme(e1,x5) & Actor(e1,x4) & v_paint(e1) & n_railway(x5) & a_underground(s1) & Theme(s1,x5) & (x2 = x4) & n_vest(x2) & of(x2,x3) & n_orange(x3) & n_worker(x1))
-exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_vest(x2) & n_person(x1))