A woman is wearing a sash while waving.
A woman wearing a sash is saying hello to a friend.
Not all women are saying hello to a friend.
exists e2 e1 x1 x2.(while(e1,e2) & Actor(e2,x1) & v_wave(e2) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_sash(x2) & n_woman(x1))
exists e1 e2 x1 x2 x3 x4 x5.(to(e2,x5) & n_friend(x5) & Theme(e2,x4) & Actor(e2,x1) & v_say(e2) & n_hello(x4) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_sash(x3) & (x1 = x2) & n_woman(x1))