-ey bbb bbc bbe bbg bbk bbo bby bcb bcc bce bcg bck bco bcy be- beb bec bee beg bek beo bey bgb bgc bge bgg bgk bgo bkb bkc bke bkg bkk bko bob boc boe bog bok boo boy by- byc bye byg byk byo c-- cbb cbc cbe cbg cbk cbo cby ccb ccc cce ccg cck cco ce- ceb cec cee ceg cek ceo cey cgb cgc cge cgg cgo cgy ckb ckc cko cky co- cob coc coe cog cok coo coy cyb cyc cye cyg cyk cyo ebb ebc ebe ebg ebk ebo eby ec- ecb ecc ece ecg eck eco eeb eec eee eeg eek eeo eey egb egc ege egg ego egy ekb ekc eke ekg eko eky eo- eob eoc eoe eog eok eoo eyc eye eyo gbc gbe gbg gbk gbo gby gcb gcc gce gcg gck gco ge- geb gec gee geg gek geo gey ggb ggc ggg ggo gkb gko gob goc goe gog gok goo goy gy- gyb gye gyo kbb kbc kbe kbk kbo kcb kcc kce kcg kck ke- keb kec kee keg kek keo key kgb kgc kgo kgy kkb kkc kke kkk kky kob koc koe kog kok koo koy kyc kye kyo ob- obb obc obe obg obk obo oby oc- ocb occ ocg ock oco oeb oec oee oeg oeo oey ogc oge ogg ogo ogy okb okc oke okg okk oko oo- oob ooc oog ook ooo oye oyo ybc ybe ybg yby ycc yce yco ycy yeb yec yee yeg yek yeo yey ygc ygo ykk yob yoc yoe yog yok yoo yoy yyb yyc yye yyg yyy