bbb bbc bbh bbk bbo bbr bby bcb bcc bch bck bco bcr bcy bhb bhc bhh bhk bho bhr bkb bkc bkk bko bkr bob boc boh bok boo bor boy brb brh brk bro brr bry by- byc byh byk byo byr c-- cbb cbc cbh cbk cbo cbr cby ccb ccc cch cck cco ccr ch- chb chc chh chk cho chr chy ckb ckc ckh cko cky co- cob coc coh cok coo cor coy crb crc crh crk cro crr cry cyb cyc cyk cyo cyr hbb hbc hbh hbk hbo hbr hby hcb hcc hch hck hco hcr hcy hhb hhc hhh hhk hho hhr hhy hkb hkh hkk hko hkr hob hoc hoh hok hoo hor hoy hr- hrb hrc hrh hrk hro hrr hy- hyb hyc hyh hyo hyr hyy kbb kbc kbh kbk kbo kbr kcb kcc kch kck kcr khh khk kho khr kkb kkc kkh kkk kkr kky kob koc koh kok koo kor koy krc krk kro krr kry kyc kyo kyr ob- obb obc obh obk obo obr oby oc- ocb occ och ock oco ocr ohc ohh oho ohr okb okc okk oko okr oo- oob ooc ooh ook ooo oor or- orb orc orh ork oro orr ory oyo rbb rbc rbh rbk rbo rbr rcb rcc rch rco rcr rh- rhb rhc rhh rho rhr rkb rkc rkk rko rky rob roc roh rok roo ror roy rrb rrc rrh rrk rrr ry- ryc ryk ryo ryr ryy ybc ybr yby ycc ych yco ycy yhc ykk yob yoc yok yoo yor yoy yrc yro yyb yyc yyy