Girls are playing volleyball.
Kids are playing volleyball.
Girls are kids.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_volleyball(x2) & n_girl(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_volleyball(x2) & n_kid(x1))