-ey bbb bbe bbi bbk bbo bbs bby be- beb bee bei bek beo bes bey bi- bib bie bii bik bio bis biy bkb bke bkk bko bks bob boe boi bok boo bos boy bsb bse bsi bsk bso bss bsy by- bye byi byk byo bys ebb ebe ebi ebk ebo ebs eby eeb eee eek eeo ees eey eib eie eii eik eio eis ekb eke eki eko eks eky eo- eob eoe eoi eok eoo eos es- esb ese esi esk eso ess esy eye eyo eys ibb ibe ibi ibk ibo ibs iby ie- iee iei iek ies iey iib iie iii iio iis ikb ike iki ikk iko iks io- iob ioe ioi ioo ios is- isb ise isi isk iso iss isy iye iyo iys iyy kbb kbe kbi kbk kbo kbs ke- keb kee kei kek keo kes key kib kie kii kik kio kis kkb kke kki kkk kks kky kob koe koi kok koo kos koy ksb kse ksi ksk kso kss kye kyo kys o-i ob- obb obe obi obk obo obs oby oeb oee oei oeo oes oey oib oie oii oik oio ois okb oke oki okk oko oks oo- oob ooi ook ooo oos os- osb ose osi osk oso oss oye oyi oyo oys sbb sbe sbi sbk sbo sbs sby se- seb see sei sek seo ses sey sib sie sii sik sio sis sk- skb ske ski skk sko sks sky sob soe soi sok soo sos soy ss- ssb sse ssi ssk sso sss sy- syb sye syi syk sys ybe ybi ybs yby yeb yee yei yek yeo yes yey yie yii yio yis yki ykk yob yoe yoi yok yoo yos yoy ysb yse ysi ysk yso yss ysy yyb yye yys yyy