a-a a-b a-i a-t aaa aab aai aar aat aay ab- aba abb abi abr abt aby ai- aia aib aii air ait aiy ar- ara arb ari arr art ary at- ata atb ati atr att ay- aya ayi ayr ayt baa bab bai bar bat bay bba bbb bbi bbr bbt bby bi- bia bib bii bir bit biy bra brb bri brr brt bry bta btb bti btr btt bty by- bya byi byr byt ia- iaa iab iai iar iat iba ibb ibi ibr ibt iby iia iib iii iir iit ir- ira irb iri irr irt iry ita itb iti itt ity iya iyr iyt iyy ra- raa rab rai rar rat ray rba rbb rbi rbr rbt ria rib rii rir rit riy rra rrb rri rrr rrt rta rtb rti rtr rtt rty ry- rya ryr ryy taa tab tai tar tat tay tba tbb tbi tbr tbt tia tib tii tir tit tiy tra trb tri trr trt try tta ttb tti ttr ttt tty tya tyr tyt yaa yab yai yar yat yay ybi ybr yby yii yir yit yra yrt yta ytr ytt yyb yyt yyy