bbb bbh bbk bbn bbo bbr bhb bhh bhk bho bhr bkb bkk bkn bko bkr bnb bnk bnn bno bnr bob boh bok bon boo bor brb brh brk brn bro brr hbb hbh hbk hbn hbo hbr hhb hhh hhk hhn hho hhr hkb hkh hkk hkn hko hkr hnb hnh hnk hnn hno hob hoh hok hon hoo hor hr- hrb hrh hrk hrn hro hrr kbb kbh kbk kbn kbo kbr khh khk khn kho khr kkb kkh kkk kkn kkr kn- knk knn kno knr kob koh kok kon koo kor krk krn kro krr nbb nbk nbn nbo nbr nhb nhh nhk nhn nhr nkk nkn nko nkr nnb nnh nnk nnn nno no- nob noh nok non noo nor nrb nrk nrn nro nrr ob- obb obh obk obn obo obr ohh ohn oho ohr okb okk oko okr on- onb onh onk onn ono onr oo- oob ooh ook oon ooo oor or- orb orh ork orn oro orr rbb rbh rbk rbn rbo rbr rh- rhb rhh rhn rho rhr rkb rkk rko rnb rnh rnn rno rnr rob roh rok ron roo ror rrb rrh rrk rrn rrr