Two young boys practicing the art of karate.
Some boys are playing.
Playing doesn't mean that the boys are practicing karate.
exists e1 s1 x1 x2 x3 x4.(n_art(x3) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_practice(e1) & of(x3,x4) & n_karate(x4) & (x1 = x2) & n_boy(x1) & a_young(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 x1.(Actor(e1,x1) & v_play(e1) & n_boy(x1))