-ey a-a a-b aaa aab aae aan aao aay ab- aba abb abe abn abo aby aea aeb aee aen aeo aey an- ana anb ane ann ano any aoa aob aoe aon aoo ay- aya aye ayn ayo baa bab bae ban bao bay bba bbb bbe bbn bbo bby be- bea beb bee ben beo bey bna bnb bne bnn bno boa bob boe bon boo boy by- bya bye byn byo eaa eab eae ean eao eba ebb ebe ebn ebo eby eea eeb eee een eeo eey en- ena enb ene enn eno eny eo- eoa eob eoe eon eoo eya eye eyn eyo naa nab nae nan nao nay nba nbb nbe nbn nbo ne- nea neb nee nen neo ney nna nnb nne nnn nno no- noa nob noe non noo noy nya nye nyn nyo nyy oaa oab oae oan oao ob- oba obb obe obn obo oby oea oeb oee oen oeo oey on- ona onb one onn ono ony oo- ooa oob oon ooo oya oye oyo yaa yab yae yan yao yay ybe yby yea yeb yee yen yeo yey yna yne ynn yny yob yoe yon yoo yoy yyb yye yyy