-er a-a a-c aaa aac aae aah aao aar aas ac- aca acc ace ach aco acr acs aea aec aee aeh aeo aer aes aha ahc ahe ahh aho ahr ahs aoa aoc aoe aoh aoo aor aos ar- ara arc are arh aro arr ars as- asa asc ase ash aso asr ass c-- caa cac cae cah cao car cas cca ccc cce cch cco ccr ccs ce- cea cec cee ceh ceo cer ces ch- cha chc che chh cho chr chs co- coa coc coe coh coo cor cos cra crc cre crh cro crr crs csa csc cse csh cso csr css eaa eac eae eah eao ear eas ec- eca ecc ece ech eco ecr ecs eea eec eee eeo eer ees eha ehc ehe ehh eho ehr ehs eo- eoa eoc eoe eoh eoo eor eos era erc ere erh ero err ers es- esa esc ese esh eso esr ess haa hac hae hah hao har has hca hcc hce hch hco hcr hcs he- hea hec hee heh heo her hes hha hhc hhe hhh hho hhr hhs hoa hoc hoe hoh hoo hor hos hr- hra hrc hre hrh hro hrr hrs hsa hsc hse hsh hsr hss oaa oac oae oah oao oar oas oc- oca occ och oco ocr ocs oea oec oee oeh oeo oer oes oha ohc ohe ohh oho ohr ohs oo- ooa ooc ooh ooo oor oos or- ora orc ore orh oro orr ors os- osa osc ose osh oso osr oss ra- raa rac rae rah rao rar ras rca rcc rce rch rco rcr rcs re- rea rec ree reh reo rer res rh- rha rhc rhe rhh rho rhr rhs roa roc roe roh roo ror ros rra rrc rrh rrr rrs rsa rsc rse rsh rso rsr rss saa sac sae sah sao sar sas sca scc sce sch sco scr scs se- sea sec see seh seo ser ses sh- sha shc she shh sho shr shs soa soc soe soh soo sor sos sr- sra src sre srh sro srr srs ss- ssa ssc sse ssh sso ssr sss