A woman is wearing a sash while waving.
A woman is waving at a nearby taxi.
Someone can wave with out waving at a taxi.
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 s1 x1 x2.(at(e1,x2) & n_taxi(x2) & a_nearby(s1) & Theme(s1,x2) & Actor(e1,x1) & v_wave(e1) & n_woman(x1))