A group of men play rugby.
women play rugby
men and women are different gender
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & n_rugby(x3) & of(x1,x2) & n_man(x2) & n_group(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_rugby(x2) & n_woman(x1))