Two children sitting on a teeter totter.
Two children play in the park.
Children sitting on a teeter totter does not necessarily imply that they play in the park.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x3) & n_totter(x3) & of(x3,x4) & n_teeter(x4) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_child(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_park(x2) & in(e1,x2) & Actor(e1,x1) & v_play(e1) & n_child(x1) & card_eq_2(x1))