a-a a-b a-i aaa aab aae aah aai aak aao ab- aba abb abe abh abi abk abo aea aeb aee aeh aei aek aeo aha ahb ahe ahh ahi ahk aho ai- aia aib aie aih aii aik aio aka akb ake akh aki akk ako aoa aob aoe aoh aoi aok aoo baa bab bae bah bai bak bao bba bbb bbe bbh bbi bbk bbo be- bea beb bee beh bei bek beo bha bhb bhe bhh bhi bhk bho bi- bia bib bie bih bii bik bio bka bkb bke bkk bko boa bob boe boh boi bok boo eaa eab eae eah eai eak eao eba ebb ebe ebh ebi ebk ebo eea eeb eee eek eeo eha ehb ehe ehh ehi eho eia eib eie eii eik eio eka ekb eke ekh eki eko eo- eoa eob eoe eoh eoi eok eoo h-i haa hab hae hah hai hak hao hba hbb hbe hbh hbi hbk hbo he- hea heb hee heh hei hek heo hha hhb hhe hhh hhi hhk hho hia hib hie hih hii hik hio hka hkb hkh hki hkk hko hoa hob hoe hoh hoi hok hoo ia- iaa iab iae iah iai iao iba ibb ibe ibh ibi ibk ibo ie- iea iee iei iek iha ihb ihe ihh ihi ihk iho iia iib iie iih iii iio ika ikb ike iki ikk iko io- ioa iob ioe ioh ioi ioo ka- kaa kab kae kah kai kak kao kba kbb kbe kbh kbi kbk kbo ke- kea keb kee keh kei kek keo kha khe khh khi khk kho kia kib kie kih kii kik kio kkb kke kkh kki kkk koa kob koe koh koi kok koo o-i oaa oab oae oah oai oak oao ob- oba obb obe obh obi obk obo oea oeb oee oeh oei oeo oha ohe ohh ohi oho oia oib oie oii oik oio oka okb oke oki okk oko oo- ooa oob ooh ooi ook ooo