-er a-a a-c aaa aac aae aaf aah aak aao aar aas ac- aca acc ace acf ach ack aco acr acs aea aec aee aef aeh aek aeo aer aes af- afa afc afe aff afh afk afo afr afs aha ahc ahe ahf ahh ahk aho ahr ahs aka akc ake akh akk ako akr aks aoa aoc aoe aof aoh aok aoo aor aos ar- ara arc are arf arh ark aro arr ars as- asa asc ase asf ash ask aso asr ass c-- caa cac cae caf cah cak cao car cas cca ccc cce ccf cch cck cco ccr ccs ce- cea cec cee cef ceh cek ceo cer ces cfa cfc cfe cff cfh cfk cfo cfr cfs ch- cha chc che chf chh chk cho chr chs cka ckc ckh cko cks co- coa coc coe cof coh cok coo cor cos cra crc cre crf crh crk cro crr crs csa csc cse csf csh csk cso csr css eaa eac eae eaf eah eak eao ear eas ec- eca ecc ece ecf ech eck eco ecr ecs eea eec eee eef eek eeo eer ees ef- efa efc efe eff efh efo efr efs eha ehc ehe ehf ehh eho ehr ehs eka ekc eke ekf ekh eko ekr eks eo- eoa eoc eoe eof eoh eok eoo eor eos era erc ere erf erh erk ero err ers es- esa esc ese esf esh esk eso esr ess faa fac fae faf fah fak fao far fas fca fcc fce fcf fck fco fcr fcs fea fec fee fef feh fek feo fer fes ffa ffc ffe fff ffh ffk ffo ffr ffs fha fhc fhe fhf fhh fho fhr fhs fka fkc fkf fkk foa foc foe fof foh fok foo for fos fra frc fre frf frh frk fro frr frs fsa fsc fse fsf fsh fsk fso fsr fss haa hac hae haf hah hak hao har has hca hcc hce hcf hch hck hco hcr hcs he- hea hec hee hef heh hek heo her hes hfa hfc hfe hff hfh hfk hfo hfr hfs hha hhc hhe hhf hhh hhk hho hhr hhs hka hkf hkh hkk hko hkr hks hoa hoc hoe hof hoh hok hoo hor hos hr- hra hrc hre hrf hrh hrk hro hrr hrs hsa hsc hse hsf hsh hsk hsr hss ka- kaa kac kae kaf kah kak kao kar kas kca kcc kce kch kck kcr kcs ke- kea kec kee kef keh kek keo ker kes kfa kfc kff kfh kfo kfs kha khe khf khh khk kho khr khs kkc kke kkh kkk kkr kks koa koc koe kof koh kok koo kor kos kra krc krf krk kro krr krs ksa ksc kse ksf ksh ksk kso ksr kss oaa oac oae oaf oah oak oao oar oas oc- oca occ ocf och ock oco ocr ocs oea oec oee oef oeh oeo oer oes of- ofa ofc ofe off ofo ofr ofs oha ohc ohe ohf ohh oho ohr ohs oka okc oke okk oko okr oks oo- ooa ooc oof ooh ook ooo oor oos or- ora orc ore orf orh ork oro orr ors os- osa osc ose osf osh osk oso osr oss ra- raa rac rae raf rah rak rao rar ras rca rcc rce rcf rch rco rcr rcs re- rea rec ree ref reh rek reo rer res rfa rfc rfe rff rfh rfk rfo rfr rfs rh- rha rhc rhe rhf rhh rho rhr rhs rkc rke rkf rkk rko rks roa roc roe rof roh rok roo ror ros rra rrc rrf rrh rrk rrr rrs rsa rsc rse rsf rsh rsk rso rsr rss saa sac sae saf sah sak sao sar sas sca scc sce scf sch sck sco scr scs se- sea sec see sef seh sek seo ser ses sfa sfc sfe sff sfh sfk sfo sfr sfs sh- sha shc she shf shh shk sho shr shs sk- ska skc ske skf skh skk sko skr sks soa soc soe sof soh sok soo sor sos sr- sra src sre srf srh srk sro srr srs ss- ssa ssc sse ssf ssh ssk sso ssr sss