Three soccer players are battling for possession of the ball.
Nobody is battling.
If three soccer players are battling, somebody (not nobody) is battling.
exists e1 x1 x2 x3 x4.(n_ball(x4) & for(e1,x3) & of(x3,x4) & n_possession(x3) & Actor(e1,x1) & v_battle(e1) & n_player(x1) & of(x1,x2) & n_soccer(x2) & card_eq_3(x1))
-exists e1 x1.(Actor(e1,x1) & v_battle(e1) & n_person(x1))