-er -ey a-a a-b aaa aab aae aan aar aay ab- aba abb abe abn abr aby aea aeb aee aen aer aey an- ana anb ane ann anr any ar- ara arb are arn arr ary ay- aya aye ayn ayr baa bab bae ban bar bay bba bbb bbe bbn bbr bby be- bea beb bee ben ber bey bna bnb bne bnn bnr bra brb bre brn brr bry by- bya bye byn byr eaa eab eae ean ear eba ebb ebe ebn ebr eby eea eeb eee een eer eey en- ena enb ene enn enr eny era erb ere ern err ery eya eye eyn eyr naa nab nae nan nar nay nba nbb nbe nbn nbr ne- nea neb nee nen ner ney nna nnb nne nnn nra nrb nre nrn nrr nry nya nye nyn nyy ra- raa rab rae ran rar ray rba rbb rbe rbn rbr re- rea reb ree ren rer rey rna rnb rnn rnr rny rra rrb rrn rrr ry- rya rye ryn ryr ryy yaa yab yae yan yar yay ybe ybr yby yea yeb yee yen yer yey yna yne ynn yny yra yre yrn yyb yye yyy