a-a a-b a-i a-t aaa aab aai aap aar aat aay ab- aba abb abi abp abr abt aby ai- aia aib aii aip air ait aiy ap- apa apb api app apr apt apy ar- ara arb ari arp arr art ary at- ata atb ati atp atr att ay- aya ayi ayp ayr ayt b-p baa bab bai bap bar bat bay bba bbb bbi bbp bbr bbt bby bi- bia bib bii bip bir bit biy bpa bpb bpi bpp bpr bpt bpy bra brb bri brp brr brt bry bta btb bti btp btr btt bty by- bya byi byp byr byt ia- iaa iab iai iap iar iat iba ibb ibi ibp ibr ibt iby iia iib iii iip iir iit ipa ipb ipi ipp ipr ipt ipy ir- ira irb iri irp irr irt iry ita itb iti itp itt ity iya iyr iyt iyy p-p paa pab pai pap par pat pay pba pbb pbi pbp pbr pbt pby pia pib pii pip pir pit ppa ppb ppi ppp ppr ppt pra prb pri prp prr prt pry pt- pta ptb pti ptp ptr ptt pty py- pya pyb pyr pyt ra- raa rab rai rap rar rat ray rba rbb rbi rbp rbr rbt ria rib rii rip rir rit riy rpa rpb rpi rpp rpr rpt rra rrb rri rrp rrr rrt rta rtb rti rtp rtr rtt rty ry- rya ryr ryy taa tab tai tap tar tat tay tba tbb tbi tbp tbr tbt tia tib tii tip tir tit tiy tpa tpb tpi tpp tpr tpt tra trb tri trp trr trt try tta ttb tti ttp ttr ttt tty tya typ tyr tyt yaa yab yai yap yar yat yay ybi ybp ybr yby yii yip yir yit ypa yra yrp yrt yta ytp ytr ytt yyb yyt yyy