-ey b-p bbb bbe bbi bbp bbt bby be- beb bee bei bep bet bey bi- bib bie bii bip bit biy bpb bpe bpi bpp bpt bpy btb bte bti btp btt bty by- bye byi byp byt ebb ebe ebi ebp ebt eby eeb eee eep eet eey eib eie eii eip eit ep- epb epe epi epp ept etb ete eti etp ett ety eye eyp eyt ibb ibe ibi ibp ibt iby ie- iee iei iep iet iey iib iie iii iip iit ipb ipe ipi ipp ipt ipy itb ite iti itp itt ity iye iyt iyy p-p pbb pbe pbi pbp pbt pby peb pee pei pep pet pey pib pie pii pip pit ppb ppe ppi ppp ppt pt- ptb pte pti ptp ptt pty py- pyb pye pyt tbb tbe tbi tbp tbt te- teb tee tei tep tet tey tib tie tii tip tit tiy tpb tpe tpi tpp tpt ttb tte tti ttp ttt tty tye typ tyt ybe ybi ybp yby yeb yee yei yep yet yey yie yii yip yit yte ytp ytt yyb yye yyt yyy