a-a a-b a-i aaa aab aai aak aao aar aay ab- aba abb abi abk abo abr aby ai- aia aib aii aik aio air aiy aka akb aki akk ako akr aoa aob aoi aok aoo aor ar- ara arb ari ark aro arr ary ay- aya ayi ayk ayo ayr baa bab bai bak bao bar bay bba bbb bbi bbk bbo bbr bby bi- bia bib bii bik bio bir biy bka bkb bkk bko bkr boa bob boi bok boo bor boy bra brb bri brk bro brr bry by- bya byi byk byo byr ia- iaa iab iai iao iar iba ibb ibi ibk ibo ibr iby iia iib iii iio iir ika ikb iki ikk iko ikr io- ioa iob ioi ioo ior ir- ira irb iri irk iro irr iry iya iyo iyr iyy ka- kaa kab kai kak kao kar kay kba kbb kbi kbk kbo kbr kia kib kii kik kio kir kkb kki kkk kkr kky koa kob koi kok koo kor koy kra kri krk kro krr kry kya kyo kyr o-i oaa oab oai oak oao oar ob- oba obb obi obk obo obr oby oia oib oii oik oio oir oka okb oki okk oko okr oo- ooa oob ooi ook ooo oor or- ora orb ori ork oro orr ory oya oyi oyo ra- raa rab rai rak rao rar ray rba rbb rbi rbk rbo rbr ria rib rii rik rio rir riy rkb rkk rko rky roa rob roi rok roo ror roy rra rrb rri rrk rrr ry- rya ryk ryo ryr ryy yaa yab yai yak yao yar yay ybi ybr yby yii yio yir yka yki ykk yob yoi yok yoo yor yoy yra yro yyb yyy