-er -ey b-p bbb bbe bbn bbp bbr bby be- beb bee ben bep ber bey bnb bne bnn bnp bnr bpb bpe bpn bpp bpr bpy brb bre brn brp brr bry by- bye byn byp byr ebb ebe ebn ebp ebr eby eeb eee een eep eer eey en- enb ene enn enp enr eny ep- epb epe epn epp epr erb ere ern erp err ery eye eyn eyp eyr nbb nbe nbn nbp nbr ne- neb nee nen nep ner ney nnb nne nnn nnp npb npe npn npp npr nrb nre nrn nrp nrr nry nye nyn nyp nyy p-p pbb pbe pbn pbp pbr pby peb pee pen pep per pey pn- pnb pne pnn pnp pnr pny ppb ppe ppn ppp ppr prb pre prn prp prr pry py- pyb pye pyn pyr rbb rbe rbn rbp rbr re- reb ree ren rep rer rey rnb rnn rnp rnr rny rpb rpe rpn rpp rpr rrb rrn rrp rrr ry- rye ryn ryr ryy ybe ybp ybr yby yeb yee yen yep yer yey yne ynn ynp yny yre yrn yrp yyb yye yyy