Some men in safety hats and orange vests are working on a building.
The men are sitting at lunch.
Men who are working on a building are no also sitting at lunch.
exists e1 x1 x2 x3 x4 x5 x6 x7.(on(e1,x7) & n_building(x7) & Actor(e1,x1) & v_work(e1) & in(x1,x2) & subset_of(x5,x2) & n_vest(x5) & of(x5,x6) & n_orange(x6) & subset_of(x3,x2) & n_hat(x3) & of(x3,x4) & n_safety(x4) & n_man(x1))
exists e1 x1 x2.(n_man(x1) & at(e1,x2) & n_lunch(x2) & Actor(e1,x1) & v_sit(e1))