Two boys play swords in the grass with rods.
Boys playing street hockey.
Boys playing swords contradicts with boys playing street hockey.
exists e1 x1 x2 x3 x4.(n_grass(x3) & with(e1,x4) & n_rod(x4) & in(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_sword(x2) & n_boy(x1) & card_eq_2(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_hockey(x3) & of(x3,x4) & n_street(x4) & (x1 = x2) & n_boy(x1))