bbb bbg bbk bbo bbs bby bgb bgg bgk bgo bgs bkb bkg bkk bko bks bob bog bok boo bos boy bsb bsg bsk bso bss bsy by- byg byk byo bys gbg gbk gbo gbs gby ggb ggg ggo ggs gkb gko gks gob gog gok goo gos goy gsb gsg gsk gso gss gy- gyb gyo gys kbb kbk kbo kbs kgb kgo kgs kgy kkb kkk kks kky kob kog kok koo kos koy ksb ksg ksk kso kss kyo kys ob- obb obg obk obo obs oby ogg ogo ogs ogy okb okg okk oko oks oo- oob oog ook ooo oos os- osb osg osk oso oss oyo oys sbb sbg sbk sbo sbs sby sgb sgg sgk sgo sgs sk- skb skg skk sko sks sky sob sog sok soo sos soy ss- ssb ssg ssk sso sss sy- syb syg syk sys ybg ybs yby ygo ykk yob yog yok yoo yos yoy ysb ysg ysk yso yss ysy yyb yyg yys yyy