-er a-a a-c aaa aac aae aah aak aao aar aas ac- aca acc ace ach ack aco acr acs aea aec aee aeh aek aeo aer aes aha ahc ahe ahh ahk aho ahr ahs aka akc ake akh akk ako akr aks aoa aoc aoe aoh aok aoo aor aos ar- ara arc are arh ark aro arr ars as- asa asc ase ash ask aso asr ass c-- caa cac cae cah cak cao car cas cca ccc cce cch cck cco ccr ccs ce- cea cec cee ceh cek ceo cer ces ch- cha chc che chh chk cho chr chs cka ckc ckh cko cks co- coa coc coe coh cok coo cor cos cra crc cre crh crk cro crr crs csa csc cse csh csk cso csr css eaa eac eae eah eak eao ear eas ec- eca ecc ece ech eck eco ecr ecs eea eec eee eek eeo eer ees eha ehc ehe ehh eho ehr ehs eka ekc eke ekh eko ekr eks eo- eoa eoc eoe eoh eok eoo eor eos era erc ere erh erk ero err ers es- esa esc ese esh esk eso esr ess haa hac hae hah hak hao har has hca hcc hce hch hck hco hcr hcs he- hea hec hee heh hek heo her hes hha hhc hhe hhh hhk hho hhr hhs hka hkh hkk hko hkr hks hoa hoc hoe hoh hok hoo hor hos hr- hra hrc hre hrh hrk hro hrr hrs hsa hsc hse hsh hsk hsr hss ka- kaa kac kae kah kak kao kar kas kca kcc kce kch kck kcr kcs ke- kea kec kee keh kek keo ker kes kha khe khh khk kho khr khs kkc kke kkh kkk kkr kks koa koc koe koh kok koo kor kos kra krc krk kro krr krs ksa ksc kse ksh ksk kso ksr kss oaa oac oae oah oak oao oar oas oc- oca occ och ock oco ocr ocs oea oec oee oeh oeo oer oes oha ohc ohe ohh oho ohr ohs oka okc oke okk oko okr oks oo- ooa ooc ooh ook ooo oor oos or- ora orc ore orh ork oro orr ors os- osa osc ose osh osk oso osr oss ra- raa rac rae rah rak rao rar ras rca rcc rce rch rco rcr rcs re- rea rec ree reh rek reo rer res rh- rha rhc rhe rhh rho rhr rhs rkc rke rkk rko rks roa roc roe roh rok roo ror ros rra rrc rrh rrk rrr rrs rsa rsc rse rsh rsk rso rsr rss saa sac sae sah sak sao sar sas sca scc sce sch sck sco scr scs se- sea sec see seh sek seo ser ses sh- sha shc she shh shk sho shr shs sk- ska skc ske skh skk sko skr sks soa soc soe soh sok soo sor sos sr- sra src sre srh srk sro srr srs ss- ssa ssc sse ssh ssk sso ssr sss