Two children are playing on a makeshift barrel swing.
A young boy swings by himself
Two children cannot be playing on a barrel swing if one child swings by himself.
exists e1 x1 x2 x3 x4.(on(e1,x2) & n_swing(x2) & of(x2,x4) & n_barrel(x4) & of(x2,x3) & n_makeshift(x3) & Actor(e1,x1) & v_play(e1) & n_child(x1) & card_eq_2(x1))
exists s1 x1 x2.(a_topic(x1) & by(x1,x2) & n_male(x2) & n_swing(x1) & of(x1,x2) & n_boy(x2) & a_young(s1) & Theme(s1,x1))