c-- ccc cch cco ccr ccs ch- chc chh cho chr chs co- coc coh coo cor cos crc crh cro crr crs csc csh cso csr css hcc hch hco hcr hcs hhc hhh hho hhr hhs hoc hoh hoo hor hos hr- hrc hrh hro hrr hrs hsc hsh hsr hss oc- occ och oco ocr ocs ohc ohh oho ohr ohs oo- ooc ooh ooo oor oos or- orc orh oro orr ors os- osc osh oso osr oss rcc rch rco rcr rcs rh- rhc rhh rho rhr rhs roc roh roo ror ros rrc rrh rrr rrs rsc rsh rso rsr rss scc sch sco scr scs sh- shc shh sho shr shs soc soh soo sor sos sr- src srh sro srr srs ss- ssc ssh sso ssr sss