Volleyball players celebrate.
Athletes celebrate.
Volleyball players are a type of athlete.
exists e1 x1 x2.(Actor(e1,x1) & v_celebrate(e1) & n_player(x1) & of(x1,x2) & n_volleyball(x2))
exists s1 x1 x2.(n_celebrate(x1) & a_.(s1) & Theme(s1,x1) & (x1 = x2) & ne_nam_athletes(x2) & a_topic(x1))