Two boys fight for the ball.
Two boys arm wrestling.
Arm wrestling is not a way to fight for the ball.
exists x1 x2 x3.(n_ball(x3) & a_topic(x1) & for(x1,x3) & n_fight(x1) & of(x1,x2) & n_boy(x2) & card_eq_2(x1))
exists s1 x1 x2 x3.(n_wrestling(x1) & a_.(s1) & Theme(s1,x1) & of(x1,x3) & n_arm(x3) & of(x1,x2) & n_boy(x2) & card_eq_2(x1) & a_topic(x1))