a-a a-b a-i a-t aaa aab aai aao aar aas aat aay ab- aba abb abi abo abr abs abt aby ai- aia aib aii aio air ais ait aiy aoa aob aoi aoo aor aos aot ar- ara arb ari aro arr ars art ary as- asa asb asi aso asr ass ast asy at- ata atb ati ato atr ats att ay- aya ayi ayo ayr ays ayt baa bab bai bao bar bas bat bay bba bbb bbi bbo bbr bbs bbt bby bi- bia bib bii bio bir bis bit biy boa bob boi boo bor bos bot boy bra brb bri bro brr brs brt bry bsa bsb bsi bso bsr bss bst bsy bta btb bti bto btr bts btt bty by- bya byi byo byr bys byt ia- iaa iab iai iao iar ias iat iba ibb ibi ibo ibr ibs ibt iby iia iib iii iio iir iis iit io- ioa iob ioi ioo ior ios iot ir- ira irb iri iro irr irs irt iry is- isa isb isi iso isr iss ist isy ita itb iti ito its itt ity iya iyo iyr iys iyt iyy o-i oaa oab oai oao oar oas oat ob- oba obb obi obo obr obs obt oby oia oib oii oio oir ois oit oo- ooa oob ooi ooo oor oos oot or- ora orb ori oro orr ors ort ory os- osa osb osi oso osr oss ost ot- ota otb oti oto otr ots ott oya oyi oyo oys ra- raa rab rai rao rar ras rat ray rba rbb rbi rbo rbr rbs rbt ria rib rii rio rir ris rit riy roa rob roi roo ror ros rot roy rra rrb rri rrr rrs rrt rsa rsb rsi rso rsr rss rst rta rtb rti rto rtr rts rtt rty ry- rya ryo ryr rys ryy saa sab sai sao sar sas sat say sba sbb sbi sbo sbr sbs sbt sby sia sib sii sio sir sis sit soa sob soi soo sor sos sot soy sr- sra srb sri sro srr srs srt sry ss- ssa ssb ssi sso ssr sss sst sta stb sti sto str sts stt sty sy- sya syb syi syr sys syt taa tab tai tao tar tas tat tay tba tbb tbi tbo tbr tbs tbt tia tib tii tio tir tis tit tiy to- toa tob toi too tor tos tot toy tra trb tri tro trr trs trt try tsa tsb tsi tso tsr tss tst tsy tta ttb tti tto ttr tts ttt tty tya tyo tyr tys tyt yaa yab yai yao yar yas yat yay ybi ybr ybs yby yii yio yir yis yit yob yoi yoo yor yos yot yoy yra yro yrs yrt ysa ysb ysi yso ysr yss yst ysy yta yto ytr yts ytt yyb yys yyt yyy