-er -ey a-a a-b aaa aab aae aan aar aau aay ab- aba abb abe abn abr abu aby aea aeb aee aen aer aeu aey an- ana anb ane ann anr anu any ar- ara arb are arn arr aru ary au- aua aub aue aun aur ay- aya aye ayn ayr ayu b-u baa bab bae ban bar bau bay bba bbb bbe bbn bbr bbu bby be- bea beb bee ben ber beu bey bna bnb bne bnn bnr bnu bra brb bre brn brr bru bry bua bub bue bun bur buu buy by- bya bye byn byr byu eaa eab eae ean ear eau eba ebb ebe ebn ebr ebu eby eea eeb eee een eer eey en- ena enb ene enn enr enu eny era erb ere ern err eru ery eu- eua eub eue eun eur eya eye eyn eyr naa nab nae nan nar nau nay nba nbb nbe nbn nbr nbu ne- nea neb nee nen ner neu ney nna nnb nne nnn nnu nra nrb nre nrn nrr nru nry nua nub nue nun nur nuu nuy nya nye nyn nyu nyy ra- raa rab rae ran rar rau ray rba rbb rbe rbn rbr rbu re- rea reb ree ren rer reu rey rna rnb rnn rnr rnu rny rra rrb rrn rrr rru rua rub rue run rur ruu ruy ry- rya rye ryn ryr ryu ryy ua- uaa uab uae uan uar uau uay uba ubb ube ubn ubr ubu uby uea ueb uee uen uer uey un- una unb une unn unr unu uny ur- ura urb ure urn urr uru ury uua uue uun uur uuu uyu yaa yab yae yan yar yau yay ybe ybr yby yea yeb yee yen yer yey yna yne ynn ynu yny yra yre yrn yru yua yue yun yur yuu yuy yyb yye yyu yyy