Four children are having a pillow fight.
Four children play Xbox.
The children can either be having a pillow fight or playing Xbox. They cannot be doing both at the same time.
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_fight(x2) & of(x2,x3) & n_pillow(x3) & n_child(x1) & card_eq_4(x1))
exists e1 x1 x2.(ne_org_xbox(x2) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_child(x1) & card_eq_4(x1))