-er a-a a-b a-i aaa aab aae aai aak aam aao aar ab- aba abb abe abi abk abm abo abr aea aeb aee aei aek aem aeo aer ai- aia aib aie aii aik aim aio air aka akb ake aki akk akm ako akr ama amb ame ami amk amm amo amr aoa aob aoe aoi aok aom aoo aor ar- ara arb are ari ark arm aro arr baa bab bae bai bak bam bao bar bba bbb bbe bbi bbk bbm bbo bbr be- bea beb bee bei bek bem beo ber bi- bia bib bie bii bik bim bio bir bka bkb bke bkk bkm bko bkr bma bmb bme bmi bmk bmm bmo bmr boa bob boe boi bok bom boo bor bra brb bre bri brk brm bro brr eaa eab eae eai eak eam eao ear eba ebb ebe ebi ebk ebm ebo ebr eea eeb eee eek eem eeo eer eia eib eie eii eik eim eio eir eka ekb eke eki eko ekr em- ema emb eme emi emk emm emo emr eo- eoa eob eoe eoi eok eom eoo eor era erb ere eri erk erm ero err ia- iaa iab iae iai iam iao iar iba ibb ibe ibi ibk ibm ibo ibr ie- iea iee iei iek iem ier iia iib iie iii iim iio iir ika ikb ike iki ikk iko ikr im- ima imb ime imi imm imo io- ioa iob ioe ioi iom ioo ior ir- ira irb ire iri irk irm iro irr ka- kaa kab kae kai kak kam kao kar kba kbb kbe kbi kbk kbm kbo kbr ke- kea keb kee kei kek kem keo ker kia kib kie kii kik kim kio kir kkb kke kki kkk kkm kkr kma kmb kme kmi kmk kmm kmo koa kob koe koi kok kom koo kor kra kri krk kro krr m-o m-r maa mab mae mai mak mam mao mar mba mbb mbe mbi mbk mbm mbo mbr mea meb mee mei mek mem meo mer mi- mia mib mie mii mik mim mio mir mka mkb mke mkk mkm mko mkr mma mmb mme mmi mmk mmm mmo mmr moa mob moe moi mok mom moo mor mra mrb mre mri mrk mrm mro mrr o-i oaa oab oae oai oak oam oao oar ob- oba obb obe obi obk obm obo obr oea oeb oee oei oem oeo oer oia oib oie oii oik oim oio oir oka okb oke oki okk oko okr om- oma omb ome omi omm omo omr oo- ooa oob ooi ook oom ooo oor or- ora orb ore ori ork orm oro orr ra- raa rab rae rai rak ram rao rar rba rbb rbe rbi rbk rbm rbo rbr re- rea reb ree rei rek rem reo rer ria rib rie rii rik rim rio rir rkb rke rkk rkm rko rma rmb rme rmi rmm rmo rmr roa rob roe roi rok rom roo ror rra rrb rri rrk rrm rrr