Two kids playing on mats.
Some kids are playing on a swing.
If the kids are on a swing, they cannot be playing on a mat.
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_mat(x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_kid(x1) & card_eq_2(x1))
exists e1 x1 x2.(on(e1,x2) & n_swing(x2) & Actor(e1,x1) & v_play(e1) & n_kid(x1))