a-a a-b a-i a-t aaa aab aaf aai aar aas aat aay ab- aba abb abf abi abr abs abt aby af- afa afb aff afi afr afs aft afy ai- aia aib aif aii air ais ait aiy ar- ara arb arf ari arr ars art ary as- asa asb asf asi asr ass ast asy at- ata atb atf ati atr ats att ay- aya ayf ayi ayr ays ayt baa bab baf bai bar bas bat bay bba bbb bbf bbi bbr bbs bbt bby bfa bfb bff bfi bfr bfs bft bfy bi- bia bib bif bii bir bis bit biy bra brb brf bri brr brs brt bry bsa bsb bsf bsi bsr bss bst bsy bta btb btf bti btr bts btt bty by- bya byf byi byr bys byt faa fab faf fai far fas fat fay fba fbb fbf fbi fbr fbs fbt ffa fff ffi ffr ffs fft ffy fia fib fif fii fir fis fit fra frb frf fri frr frs frt fry fsa fsb fsf fsi fsr fss fst fta ftb ftf fti ftr fts ftt fty fy- fya fyb fyi i-f ia- iaa iab iaf iai iar ias iat iba ibb ibf ibi ibr ibs ibt iby ifa ifb iff ifi ifr ifs ift ify iia iib iif iii iir iis iit ir- ira irb irf iri irr irs irt iry is- isa isb isf isi isr iss ist isy ita itb itf iti its itt ity iya iyr iys iyt iyy ra- raa rab raf rai rar ras rat ray rba rbb rbf rbi rbr rbs rbt rfa rfb rff rfi rfr rfs rft ria rib rif rii rir ris rit riy rra rrb rrf rri rrr rrs rrt rsa rsb rsf rsi rsr rss rst rta rtb rtf rti rtr rts rtt rty ry- rya ryf ryr rys ryy saa sab saf sai sar sas sat say sba sbb sbf sbi sbr sbs sbt sby sfa sfb sff sfi sfr sfs sft sia sib sif sii sir sis sit sr- sra srb srf sri srr srs srt sry ss- ssa ssb ssf ssi ssr sss sst sta stb stf sti str sts stt sty sy- sya syb syi syr sys syt taa tab taf tai tar tas tat tay tba tbb tbf tbi tbr tbs tbt tfa tfb tff tfi tfr tfs tft tia tib tif tii tir tis tit tiy tra trb trf tri trr trs trt try tsa tsb tsf tsi tsr tss tst tsy tta ttb ttf tti ttr tts ttt tty tya tyf tyr tys tyt yaa yab yaf yai yar yas yat yay ybf ybi ybr ybs yby yfa yff yfr yfs yft yif yii yir yis yit yra yrf yrs yrt ysa ysb ysi ysr yss yst ysy yta ytf ytr yts ytt yyb yyf yys yyt yyy