a-a a-c aaa aac aah aao aar aas ac- aca acc ach aco acr acs aha ahc ahh aho ahr ahs aoa aoc aoh aoo aor aos ar- ara arc arh aro arr ars as- asa asc ash aso asr ass c-- caa cac cah cao car cas cca ccc cch cco ccr ccs ch- cha chc chh cho chr chs co- coa coc coh coo cor cos cra crc crh cro crr crs csa csc csh cso csr css haa hac hah hao har has hca hcc hch hco hcr hcs hha hhc hhh hho hhr hhs hoa hoc hoh hoo hor hos hr- hra hrc hrh hro hrr hrs hsa hsc hsh hsr hss oaa oac oah oao oar oas oc- oca occ och oco ocr ocs oha ohc ohh oho ohr ohs oo- ooa ooc ooh ooo oor oos or- ora orc orh oro orr ors os- osa osc osh oso osr oss ra- raa rac rah rao rar ras rca rcc rch rco rcr rcs rh- rha rhc rhh rho rhr rhs roa roc roh roo ror ros rra rrc rrh rrr rrs rsa rsc rsh rso rsr rss saa sac sah sao sar sas sca scc sch sco scr scs sh- sha shc shh sho shr shs soa soc soh soo sor sos sr- sra src srh sro srr srs ss- ssa ssc ssh sso ssr sss