A hockey game where two players are going after the puck as a referee looks on.
There is no referee  in this hockey game.
Can't be and not be at the same time a referee in the same game.
exists p1 x1 x2 x4.(n_puck(x4) & a_topic(x1) & exists e1 p2 x3.(exists e2 p3 x5.(exists s1.(Theme(s1,x5) & a_on(s1)) & Topic(e2,p3) & Actor(e2,x5) & v_look(e2) & n_referee(x5)) & as(e1,p2) & after(e1,x4) & Actor(e1,x3) & v_go(e1) & n_player(x3) & card_eq_2(x3)) & where(x1,p1) & n_game(x1) & of(x1,x2) & n_hockey(x2))
exists p1 x1 x3 x4.(n_game(x3) & of(x3,x4) & n_hockey(x4) & -exists x2.((x1 = x2) & in(x2,x3) & n_referee(x2)))