a-a a-b a-i a-t aaa aab aai aak aao aar aat aay ab- aba abb abi abk abo abr abt aby ai- aia aib aii aik aio air ait aiy aka akb aki akk ako akr aoa aob aoi aok aoo aor aot ar- ara arb ari ark aro arr art ary at- ata atb ati ato atr att ay- aya ayi ayk ayo ayr ayt baa bab bai bak bao bar bat bay bba bbb bbi bbk bbo bbr bbt bby bi- bia bib bii bik bio bir bit biy bka bkb bkk bko bkr bkt boa bob boi bok boo bor bot boy bra brb bri brk bro brr brt bry bta btb bti btk bto btr btt bty by- bya byi byk byo byr byt ia- iaa iab iai iao iar iat iba ibb ibi ibk ibo ibr ibt iby iia iib iii iio iir iit ika ikb iki ikk iko ikr ikt io- ioa iob ioi ioo ior iot ir- ira irb iri irk iro irr irt iry ita itb iti itk ito itt ity iya iyo iyr iyt iyy k-t ka- kaa kab kai kak kao kar kat kay kba kbb kbi kbk kbo kbr kia kib kii kik kio kir kit kkb kki kkk kkr kkt kky koa kob koi kok koo kor kot koy kra kri krk kro krr krt kry kta ktb ktk kto ktr ktt kya kyo kyr kyt o-i oaa oab oai oak oao oar oat ob- oba obb obi obk obo obr obt oby oia oib oii oik oio oir oit oka okb oki okk oko okr oo- ooa oob ooi ook ooo oor oot or- ora orb ori ork oro orr ort ory ot- ota otb oti otk oto otr ott oya oyi oyo ra- raa rab rai rak rao rar rat ray rba rbb rbi rbk rbo rbr rbt ria rib rii rik rio rir rit riy rkb rkk rko rkt rky roa rob roi rok roo ror rot roy rra rrb rri rrk rrr rrt rta rtb rti rtk rto rtr rtt rty ry- rya ryk ryo ryr ryy taa tab tai tak tao tar tat tay tba tbb tbi tbk tbo tbr tbt tia tib tii tik tio tir tit tiy tka tkb tkk tko tkr tkt tky to- toa tob toi tok too tor tot toy tra trb tri trk tro trr trt try tta ttb tti ttk tto ttr ttt tty tya tyo tyr tyt yaa yab yai yak yao yar yat yay ybi ybr yby yii yio yir yit yka yki ykk yob yoi yok yoo yor yot yoy yra yro yrt yta ytk yto ytr ytt yyb yyt yyy