bbb bbc bbh bbk bbn bbo bbr bcb bcc bch bck bcn bco bcr bhb bhc bhh bhk bho bhr bkb bkc bkk bkn bko bkr bnb bnc bnk bnn bno bnr bob boc boh bok bon boo bor brb brh brk brn bro brr c-- cbb cbc cbh cbk cbn cbo cbr ccb ccc cch cck ccn cco ccr ch- chb chc chh chk chn cho chr ckb ckc ckh cko cn- cnb cnc cnh cnn cno cnr co- cob coc coh cok con coo cor crb crc crh crk crn cro crr hbb hbc hbh hbk hbn hbo hbr hcb hcc hch hck hcn hco hcr hhb hhc hhh hhk hhn hho hhr hkb hkh hkk hkn hko hkr hnb hnc hnh hnk hnn hno hob hoc hoh hok hon hoo hor hr- hrb hrc hrh hrk hrn hro hrr kbb kbc kbh kbk kbn kbo kbr kcb kcc kch kck kcn kcr khh khk khn kho khr kkb kkc kkh kkk kkn kkr kn- knc knk knn kno knr kob koc koh kok kon koo kor krc krk krn kro krr nbb nbc nbk nbn nbo nbr ncb ncc nch nck ncn nco ncr nhb nhc nhh nhk nhn nhr nkc nkk nkn nko nkr nnb nnc nnh nnk nnn nno no- nob noc noh nok non noo nor nrb nrc nrk nrn nro nrr ob- obb obc obh obk obn obo obr oc- ocb occ och ock ocn oco ocr ohc ohh ohn oho ohr okb okc okk oko okr on- onb onc onh onk onn ono onr oo- oob ooc ooh ook oon ooo oor or- orb orc orh ork orn oro orr rbb rbc rbh rbk rbn rbo rbr rcb rcc rch rcn rco rcr rh- rhb rhc rhh rhn rho rhr rkb rkc rkk rko rnb rnc rnh rnn rno rnr rob roc roh rok ron roo ror rrb rrc rrh rrk rrn rrr