_____________              _____________              _____________
|             |            |             |            |             |
|     163     |    <-->    |     474     |    <-->    |     616     |
|_____________|            |_____________|            |_____________|

   "s__((nn)r..._n...S_m_n([nn)...]p_t

                  p_t[[......s]_]_((pp)r......_n......S_m_n(
         
                                           pp)......"
s__((qq)r....._n.....p_[t.....S_m]_
                   n[(qq).....]"
                                                   .S_m_n(rr)......s__
((rr)r......p_t......_n......"
                                       
                .
              S_m_[n(ss).p_t._n.]"s_
                       _((ss)r


                            "p_t....S_m_n(tt)...._n....s__((t
        
  t][)r