-ey a-a a-b aaa aab aae aak aao aay ab- aba abb abe abk abo aby aea aeb aee aek aeo aey aka akb ake akk ako aoa aob aoe aok aoo ay- aya aye ayk ayo baa bab bae bak bao bay bba bbb bbe bbk bbo bby be- bea beb bee bek beo bey bka bkb bke bkk bko boa bob boe bok boo boy by- bya bye byk byo eaa eab eae eak eao eba ebb ebe ebk ebo eby eea eeb eee eek eeo eey eka ekb eke eko eky eo- eoa eob eoe eok eoo eya eye eyo ka- kaa kab kae kak kao kay kba kbb kbe kbk kbo ke- kea keb kee kek keo key kkb kke kkk kky koa kob koe kok koo koy kya kye kyo oaa oab oae oak oao ob- oba obb obe obk obo oby oea oeb oee oeo oey oka okb oke okk oko oo- ooa oob ook ooo oya oye oyo yaa yab yae yak yao yay ybe yby yea yeb yee yek yeo yey yka ykk yob yoe yok yoo yoy yyb yye yyy