-er a-a a-b a-i aaa aab aae aai aak aam aao aar aas ab- aba abb abe abi abk abm abo abr abs aea aeb aee aei aek aem aeo aer aes ai- aia aib aie aii aik aim aio air ais aka akb ake aki akk akm ako akr aks ama amb ame ami amk amm amo amr ams aoa aob aoe aoi aok aom aoo aor aos ar- ara arb are ari ark arm aro arr ars as- asa asb ase asi ask asm aso asr ass baa bab bae bai bak bam bao bar bas bba bbb bbe bbi bbk bbm bbo bbr bbs be- bea beb bee bei bek bem beo ber bes bi- bia bib bie bii bik bim bio bir bis bka bkb bke bkk bkm bko bkr bks bma bmb bme bmi bmk bmm bmo bmr bms boa bob boe boi bok bom boo bor bos bra brb bre bri brk brm bro brr brs bsa bsb bse bsi bsk bsm bso bsr bss eaa eab eae eai eak eam eao ear eas eba ebb ebe ebi ebk ebm ebo ebr ebs eea eeb eee eek eem eeo eer ees eia eib eie eii eik eim eio eir eis eka ekb eke eki eko ekr eks em- ema emb eme emi emk emm emo emr ems eo- eoa eob eoe eoi eok eom eoo eor eos era erb ere eri erk erm ero err ers es- esa esb ese esi esk esm eso esr ess ia- iaa iab iae iai iam iao iar ias iba ibb ibe ibi ibk ibm ibo ibr ibs ie- iea iee iei iek iem ier ies iia iib iie iii iim iio iir iis ika ikb ike iki ikk iko ikr iks im- ima imb ime imi imm imo ims io- ioa iob ioe ioi iom ioo ior ios ir- ira irb ire iri irk irm iro irr irs is- isa isb ise isi isk ism iso isr iss ka- kaa kab kae kai kak kam kao kar kas kba kbb kbe kbi kbk kbm kbo kbr kbs ke- kea keb kee kei kek kem keo ker kes kia kib kie kii kik kim kio kir kis kkb kke kki kkk kkm kkr kks kma kmb kme kmi kmk kmm kmo kms koa kob koe koi kok kom koo kor kos kra kri krk kro krr krs ksa ksb kse ksi ksk ksm kso ksr kss m-o m-r maa mab mae mai mak mam mao mar mas mba mbb mbe mbi mbk mbm mbo mbr mbs mea meb mee mei mek mem meo mer mes mi- mia mib mie mii mik mim mio mir mis mka mkb mke mkk mkm mko mkr mks mma mmb mme mmi mmk mmm mmo mmr mms moa mob moe moi mok mom moo mor mos mra mrb mre mri mrk mrm mro mrr mrs msa msb mse msi msk msm mso msr mss o-i oaa oab oae oai oak oam oao oar oas ob- oba obb obe obi obk obm obo obr obs oea oeb oee oei oem oeo oer oes oia oib oie oii oik oim oio oir ois oka okb oke oki okk oko okr oks om- oma omb ome omi omm omo omr oms oo- ooa oob ooi ook oom ooo oor oos or- ora orb ore ori ork orm oro orr ors os- osa osb ose osi osk osm oso osr oss ra- raa rab rae rai rak ram rao rar ras rba rbb rbe rbi rbk rbm rbo rbr rbs re- rea reb ree rei rek rem reo rer res ria rib rie rii rik rim rio rir ris rkb rke rkk rkm rko rks rma rmb rme rmi rmm rmo rmr rms roa rob roe roi rok rom roo ror ros rra rrb rri rrk rrm rrr rrs rsa rsb rse rsi rsk rsm rso rsr rss saa sab sae sai sak sam sao sar sas sba sbb sbe sbi sbk sbm sbo sbr sbs se- sea seb see sei sek sem seo ser ses sia sib sie sii sik sim sio sir sis sk- ska skb ske ski skk skm sko skr sks sma smb sme smi smk smm smo smr sms soa sob soe soi sok som soo sor sos sr- sra srb sre sri srk srm sro srr srs ss- ssa ssb sse ssi ssk ssm sso ssr sss