-ey a-a a-b aaa aab aae aao aas aay ab- aba abb abe abo abs aby aea aeb aee aeo aes aey aoa aob aoe aoo aos as- asa asb ase aso ass asy ay- aya aye ayo ays baa bab bae bao bas bay bba bbb bbe bbo bbs bby be- bea beb bee beo bes bey boa bob boe boo bos boy bsa bsb bse bso bss bsy by- bya bye byo bys eaa eab eae eao eas eba ebb ebe ebo ebs eby eea eeb eee eeo ees eey eo- eoa eob eoe eoo eos es- esa esb ese eso ess esy eya eye eyo eys oaa oab oae oao oas ob- oba obb obe obo obs oby oea oeb oee oeo oes oey oo- ooa oob ooo oos os- osa osb ose oso oss oya oye oyo oys saa sab sae sao sas say sba sbb sbe sbo sbs sby se- sea seb see seo ses sey soa sob soe soo sos soy ss- ssa ssb sse sso sss sy- sya syb sye sys yaa yab yae yao yas yay ybe ybs yby yea yeb yee yeo yes yey yob yoe yoo yos yoy ysa ysb yse yso yss ysy yyb yye yys yyy