Four people are singing Karaoke.
The people are playing darts.
Playing darts is different from singing Karaoke.
exists e1 x1 x2.(ne_nam_karaoke(x2) & Theme(e1,x2) & Actor(e1,x1) & v_sing(e1) & n_people(x1) & card_eq_4(x1))
exists e1 x1 x2.(n_people(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_dart(x2))