a-a a-b a-i a-t aaa aab aai aap aat aay ab- aba abb abi abp abt aby ai- aia aib aii aip ait aiy ap- apa apb api app apt apy at- ata atb ati atp att ay- aya ayi ayp ayt b-p baa bab bai bap bat bay bba bbb bbi bbp bbt bby bi- bia bib bii bip bit biy bpa bpb bpi bpp bpt bpy bta btb bti btp btt bty by- bya byi byp byt ia- iaa iab iai iap iat iba ibb ibi ibp ibt iby iia iib iii iip iit ipa ipb ipi ipp ipt ipy ita itb iti itp itt ity iya iyt iyy p-p paa pab pai pap pat pay pba pbb pbi pbp pbt pby pia pib pii pip pit ppa ppb ppi ppp ppt pt- pta ptb pti ptp ptt pty py- pya pyb pyt taa tab tai tap tat tay tba tbb tbi tbp tbt tia tib tii tip tit tiy tpa tpb tpi tpp tpt tta ttb tti ttp ttt tty tya typ tyt yaa yab yai yap yat yay ybi ybp yby yii yip yit ypa yta ytp ytt yyb yyt yyy