a-a a-b a-i aaa aab aai aak aar aas aay ab- aba abb abi abk abr abs aby ai- aia aib aii aik air ais aiy aka akb aki akk akr aks ar- ara arb ari ark arr ars ary as- asa asb asi ask asr ass asy ay- aya ayi ayk ayr ays baa bab bai bak bar bas bay bba bbb bbi bbk bbr bbs bby bi- bia bib bii bik bir bis biy bka bkb bkk bkr bks bra brb bri brk brr brs bry bsa bsb bsi bsk bsr bss bsy by- bya byi byk byr bys ia- iaa iab iai iar ias iba ibb ibi ibk ibr ibs iby iia iib iii iir iis ika ikb iki ikk ikr iks ir- ira irb iri irk irr irs iry is- isa isb isi isk isr iss isy iya iyr iys iyy ka- kaa kab kai kak kar kas kay kba kbb kbi kbk kbr kbs kia kib kii kik kir kis kkb kki kkk kkr kks kky kra kri krk krr krs kry ksa ksb ksi ksk ksr kss kya kyr kys ra- raa rab rai rak rar ras ray rba rbb rbi rbk rbr rbs ria rib rii rik rir ris riy rkb rkk rks rky rra rrb rri rrk rrr rrs rsa rsb rsi rsk rsr rss ry- rya ryk ryr rys ryy saa sab sai sak sar sas say sba sbb sbi sbk sbr sbs sby sia sib sii sik sir sis sk- ska skb ski skk skr sks sky sr- sra srb sri srk srr srs sry ss- ssa ssb ssi ssk ssr sss sy- sya syb syi syk syr sys yaa yab yai yak yar yas yay ybi ybr ybs yby yii yir yis yka yki ykk yra yrs ysa ysb ysi ysk ysr yss ysy yyb yys yyy