a-a a-b a-i a-t aaa aab aai aar aas aat aay ab- aba abb abi abr abs abt aby ai- aia aib aii air ais ait aiy ar- ara arb ari arr ars art ary as- asa asb asi asr ass ast asy at- ata atb ati atr ats att ay- aya ayi ayr ays ayt baa bab bai bar bas bat bay bba bbb bbi bbr bbs bbt bby bi- bia bib bii bir bis bit biy bra brb bri brr brs brt bry bsa bsb bsi bsr bss bst bsy bta btb bti btr bts btt bty by- bya byi byr bys byt ia- iaa iab iai iar ias iat iba ibb ibi ibr ibs ibt iby iia iib iii iir iis iit ir- ira irb iri irr irs irt iry is- isa isb isi isr iss ist isy ita itb iti its itt ity iya iyr iys iyt iyy ra- raa rab rai rar ras rat ray rba rbb rbi rbr rbs rbt ria rib rii rir ris rit riy rra rrb rri rrr rrs rrt rsa rsb rsi rsr rss rst rta rtb rti rtr rts rtt rty ry- rya ryr rys ryy saa sab sai sar sas sat say sba sbb sbi sbr sbs sbt sby sia sib sii sir sis sit sr- sra srb sri srr srs srt sry ss- ssa ssb ssi ssr sss sst sta stb sti str sts stt sty sy- sya syb syi syr sys syt taa tab tai tar tas tat tay tba tbb tbi tbr tbs tbt tia tib tii tir tis tit tiy tra trb tri trr trs trt try tsa tsb tsi tsr tss tst tsy tta ttb tti ttr tts ttt tty tya tyr tys tyt yaa yab yai yar yas yat yay ybi ybr ybs yby yii yir yis yit yra yrs yrt ysa ysb ysi ysr yss yst ysy yta ytr yts ytt yyb yys yyt yyy