	N 
  C12 
  C11 
    P 
  O13 
  O14 
  O11 
  O12 
   C1 
   C2 
  O21 
  C21 
  O22 
  C22 
   C3 
  O31 
  C31 
  O32 
  C32 
  C23 
  C24 
  C25 	
  C26 
  C27 
  C28 
  C29 
 C210 
 C211 
 C212 
  C33 
  C34 
  C35 	 
  C36 
  C37 
  C38 
  C39 
 C310 
 C311 
 C312 
