c-- ccc cch ccn cco ccs ch- chc chh chn cho chs cn- cnc cnh cnn cno cns co- coc coh con coo cos csc csh csn cso css hcc hch hcn hco hcs hhc hhh hhn hho hhs hnc hnh hnn hno hns hoc hoh hon hoo hos hsc hsh hsn hss ncc nch ncn nco ncs nhc nhh nhn nhs nnc nnh nnn nno nns no- noc noh non noo nos nsc nsh nsn nso nss oc- occ och ocn oco ocs ohc ohh ohn oho ohs on- onc onh onn ono ons oo- ooc ooh oon ooo oos os- osc osh osn oso oss scc sch scn sco scs sh- shc shh shn sho shs snc snn sno sns soc soh son soo sos ss- ssc ssh ssn sso sss