-er -ey a-a a-b aaa aab aae aan aao aar aay ab- aba abb abe abn abo abr aby aea aeb aee aen aeo aer aey an- ana anb ane ann ano anr any aoa aob aoe aon aoo aor ar- ara arb are arn aro arr ary ay- aya aye ayn ayo ayr baa bab bae ban bao bar bay bba bbb bbe bbn bbo bbr bby be- bea beb bee ben beo ber bey bna bnb bne bnn bno bnr boa bob boe bon boo bor boy bra brb bre brn bro brr bry by- bya bye byn byo byr eaa eab eae ean eao ear eba ebb ebe ebn ebo ebr eby eea eeb eee een eeo eer eey en- ena enb ene enn eno enr eny eo- eoa eob eoe eon eoo eor era erb ere ern ero err ery eya eye eyn eyo eyr naa nab nae nan nao nar nay nba nbb nbe nbn nbo nbr ne- nea neb nee nen neo ner ney nna nnb nne nnn nno no- noa nob noe non noo nor noy nra nrb nre nrn nro nrr nry nya nye nyn nyo nyy oaa oab oae oan oao oar ob- oba obb obe obn obo obr oby oea oeb oee oen oeo oer oey on- ona onb one onn ono onr ony oo- ooa oob oon ooo oor or- ora orb ore orn oro orr ory oya oye oyo ra- raa rab rae ran rao rar ray rba rbb rbe rbn rbo rbr re- rea reb ree ren reo rer rey rna rnb rnn rno rnr rny roa rob roe ron roo ror roy rra rrb rrn rrr ry- rya rye ryn ryo ryr ryy yaa yab yae yan yao yar yay ybe ybr yby yea yeb yee yen yeo yer yey yna yne ynn yny yob yoe yon yoo yor yoy yra yre yrn yro yyb yye yyy