Two construction workers have a discussion while on the work site.
Two mailmen deliver mail in the neighborhood.
The two people cannot be construction workers and mailmen simultaneously
exists e1 x1 x2 x3 x4 x5.(n_site(x4) & of(x4,x5) & n_work(x5) & on(e1,x4) & r_while(e1) & Theme(e1,x3) & Actor(e1,x1) & v_have(e1) & n_discussion(x3) & n_worker(x1) & of(x1,x2) & n_construction(x2) & card_eq_2(x1))
exists e1 x1 x2 x3.(n_neighborhood(x3) & in(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_deliver(e1) & n_mail(x2) & n_mailman(x1) & card_eq_2(x1))