a-a a-b a-i aaa aab aaf aai aak aao aar aas aay ab- aba abb abf abi abk abo abr abs aby af- afa afb aff afi afk afo afr afs afy ai- aia aib aif aii aik aio air ais aiy aka akb aki akk ako akr aks aoa aob aof aoi aok aoo aor aos ar- ara arb arf ari ark aro arr ars ary as- asa asb asf asi ask aso asr ass asy ay- aya ayf ayi ayk ayo ayr ays baa bab baf bai bak bao bar bas bay bba bbb bbf bbi bbk bbo bbr bbs bby bfa bfb bff bfi bfo bfr bfs bfy bi- bia bib bif bii bik bio bir bis biy bka bkb bkf bkk bko bkr bks boa bob bof boi bok boo bor bos boy bra brb brf bri brk bro brr brs bry bsa bsb bsf bsi bsk bso bsr bss bsy by- bya byf byi byk byo byr bys faa fab faf fai fak fao far fas fay fba fbb fbf fbi fbk fbo fbr fbs ffa fff ffi ffk ffo ffr ffs ffy fia fib fif fii fik fir fis fka fkb fkf fki fkk foa fob fof foi fok foo for fos foy fra frb frf fri frk fro frr frs fry fsa fsb fsf fsi fsk fso fsr fss fy- fya fyb fyi fyk fyo i-f ia- iaa iab iaf iai iao iar ias iba ibb ibf ibi ibk ibo ibr ibs iby ifa ifb iff ifi ifo ifr ifs ify iia iib iif iii iio iir iis ika ikb ikf iki ikk iko ikr iks io- ioa iob iof ioi ioo ior ios ir- ira irb irf iri irk iro irr irs iry is- isa isb isf isi isk iso isr iss isy iya iyo iyr iys iyy ka- kaa kab kaf kai kak kao kar kas kay kba kbb kbf kbi kbk kbo kbr kbs kfa kff kfi kfo kfs kia kib kif kii kik kio kir kis kkb kki kkk kkr kks kky koa kob kof koi kok koo kor kos koy kra krf kri krk kro krr krs kry ksa ksb ksf ksi ksk kso ksr kss kya kyo kyr kys o-i oaa oab oaf oai oak oao oar oas ob- oba obb obf obi obk obo obr obs oby of- ofa ofb off ofi ofo ofr ofs oia oib oif oii oik oio oir ois oka okb oki okk oko okr oks oo- ooa oob oof ooi ook ooo oor oos or- ora orb orf ori ork oro orr ors ory os- osa osb osf osi osk oso osr oss oya oyi oyo oys ra- raa rab raf rai rak rao rar ras ray rba rbb rbf rbi rbk rbo rbr rbs rfa rfb rff rfi rfk rfo rfr rfs ria rib rif rii rik rio rir ris riy rkb rkf rkk rko rks rky roa rob rof roi rok roo ror ros roy rra rrb rrf rri rrk rrr rrs rsa rsb rsf rsi rsk rso rsr rss ry- rya ryf ryk ryo ryr rys ryy saa sab saf sai sak sao sar sas say sba sbb sbf sbi sbk sbo sbr sbs sby sfa sfb sff sfi sfk sfo sfr sfs sia sib sif sii sik sio sir sis sk- ska skb skf ski skk sko skr sks sky soa sob sof soi sok soo sor sos soy sr- sra srb srf sri srk sro srr srs sry ss- ssa ssb ssf ssi ssk sso ssr sss sy- sya syb syi syk syr sys yaa yab yaf yai yak yao yar yas yay ybf ybi ybr ybs yby yfa yff yfr yfs yif yii yio yir yis yka yki ykk yob yof yoi yok yoo yor yos yoy yra yrf yro yrs ysa ysb ysi ysk yso ysr yss ysy yyb yyf yys yyy