Two children on one swing at a park with other children.
Children playing at a park.
If children are playing being on a swing is a form of playing.
exists x1 x2 x3 x4.(a_topic(x1) & on(x1,x2) & at(x2,x3) & with(x3,x4) & -(x4 = x1) & n_child(x1) & n_child(x1) & n_child(x4) & n_park(x3) & n_swing(x2) & card_eq_1(x2) & card_eq_2(x1))
exists e1 x1 x2 x3.(a_topic(x1) & at(e1,x3) & n_park(x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_child(x1))