A young girl sits on the edge of a sink.
A young girl washes her hands.
A girl could be sit on a sink for all sorts of reasons besides washing her hands.
exists e1 s1 x1 x2 x3.(n_edge(x2) & on(e1,x2) & of(x2,x3) & n_sink(x3) & Actor(e1,x1) & v_sit(e1) & n_girl(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_wash(e1) & n_hand(x2) & of(x2,x1) & n_female(x1) & n_girl(x1) & a_young(s1) & Theme(s1,x1))