a-a a-b a-i aaa aab aah aai aak aao aar ab- aba abb abh abi abk abo abr aha ahb ahh ahi ahk aho ahr ai- aia aib aih aii aik aio air aka akb akh aki akk ako akr aoa aob aoh aoi aok aoo aor ar- ara arb arh ari ark aro arr baa bab bah bai bak bao bar bba bbb bbh bbi bbk bbo bbr bha bhb bhh bhi bhk bho bhr bi- bia bib bih bii bik bio bir bka bkb bkk bko bkr boa bob boh boi bok boo bor bra brb brh bri brk bro brr h-i haa hab hah hai hak hao har hba hbb hbh hbi hbk hbo hbr hha hhb hhh hhi hhk hho hhr hia hib hih hii hik hio hir hka hkb hkh hki hkk hko hkr hoa hob hoh hoi hok hoo hor hr- hra hrb hrh hri hrk hro hrr ia- iaa iab iah iai iao iar iba ibb ibh ibi ibk ibo ibr iha ihb ihh ihi ihk iho ihr iia iib iih iii iio iir ika ikb iki ikk iko ikr io- ioa iob ioh ioi ioo ior ir- ira irb iri irk iro irr ka- kaa kab kah kai kak kao kar kba kbb kbh kbi kbk kbo kbr kha khh khi khk kho khr kia kib kih kii kik kio kir kkb kkh kki kkk kkr koa kob koh koi kok koo kor kra kri krk kro krr o-i oaa oab oah oai oak oao oar ob- oba obb obh obi obk obo obr oha ohh ohi oho ohr oia oib oii oik oio oir oka okb oki okk oko okr oo- ooa oob ooh ooi ook ooo oor or- ora orb orh ori ork oro orr ra- raa rab rah rai rak rao rar rba rbb rbh rbi rbk rbo rbr rh- rha rhb rhh rhi rho rhr ria rib rih rii rik rio rir rkb rkk rko roa rob roh roi rok roo ror rra rrb rrh rri rrk rrr