a-a a-b a-i a-t aaa aab aaf aai aar aat aay ab- aba abb abf abi abr abt aby af- afa afb aff afi afr aft afy ai- aia aib aif aii air ait aiy ar- ara arb arf ari arr art ary at- ata atb atf ati atr att ay- aya ayf ayi ayr ayt baa bab baf bai bar bat bay bba bbb bbf bbi bbr bbt bby bfa bfb bff bfi bfr bft bfy bi- bia bib bif bii bir bit biy bra brb brf bri brr brt bry bta btb btf bti btr btt bty by- bya byf byi byr byt faa fab faf fai far fat fay fba fbb fbf fbi fbr fbt ffa fff ffi ffr fft ffy fia fib fif fii fir fit fra frb frf fri frr frt fry fta ftb ftf fti ftr ftt fty fy- fya fyb fyi i-f ia- iaa iab iaf iai iar iat iba ibb ibf ibi ibr ibt iby ifa ifb iff ifi ifr ift ify iia iib iif iii iir iit ir- ira irb irf iri irr irt iry ita itb itf iti itt ity iya iyr iyt iyy ra- raa rab raf rai rar rat ray rba rbb rbf rbi rbr rbt rfa rfb rff rfi rfr rft ria rib rif rii rir rit riy rra rrb rrf rri rrr rrt rta rtb rtf rti rtr rtt rty ry- rya ryf ryr ryy taa tab taf tai tar tat tay tba tbb tbf tbi tbr tbt tfa tfb tff tfi tfr tft tia tib tif tii tir tit tiy tra trb trf tri trr trt try tta ttb ttf tti ttr ttt tty tya tyf tyr tyt yaa yab yaf yai yar yat yay ybf ybi ybr yby yfa yff yfr yft yif yii yir yit yra yrf yrt yta ytf ytr ytt yyb yyf yyt yyy