a-a a-b a-i aaa aab aaf aai aar aas aay ab- aba abb abf abi abr abs aby af- afa afb aff afi afr afs afy ai- aia aib aif aii air ais aiy ar- ara arb arf ari arr ars ary as- asa asb asf asi asr ass asy ay- aya ayf ayi ayr ays baa bab baf bai bar bas bay bba bbb bbf bbi bbr bbs bby bfa bfb bff bfi bfr bfs bfy bi- bia bib bif bii bir bis biy bra brb brf bri brr brs bry bsa bsb bsf bsi bsr bss bsy by- bya byf byi byr bys faa fab faf fai far fas fay fba fbb fbf fbi fbr fbs ffa fff ffi ffr ffs ffy fia fib fif fii fir fis fra frb frf fri frr frs fry fsa fsb fsf fsi fsr fss fy- fya fyb fyi i-f ia- iaa iab iaf iai iar ias iba ibb ibf ibi ibr ibs iby ifa ifb iff ifi ifr ifs ify iia iib iif iii iir iis ir- ira irb irf iri irr irs iry is- isa isb isf isi isr iss isy iya iyr iys iyy ra- raa rab raf rai rar ras ray rba rbb rbf rbi rbr rbs rfa rfb rff rfi rfr rfs ria rib rif rii rir ris riy rra rrb rrf rri rrr rrs rsa rsb rsf rsi rsr rss ry- rya ryf ryr rys ryy saa sab saf sai sar sas say sba sbb sbf sbi sbr sbs sby sfa sfb sff sfi sfr sfs sia sib sif sii sir sis sr- sra srb srf sri srr srs sry ss- ssa ssb ssf ssi ssr sss sy- sya syb syi syr sys yaa yab yaf yai yar yas yay ybf ybi ybr ybs yby yfa yff yfr yfs yif yii yir yis yra yrf yrs ysa ysb ysi ysr yss ysy yyb yyf yys yyy