bbb bbc bbh bbn bbo bbr bcb bcc bch bcn bco bcr bhb bhc bhh bho bhr bnb bnc bnn bno bnr bob boc boh bon boo bor brb brh brn bro brr c-- cbb cbc cbh cbn cbo cbr ccb ccc cch ccn cco ccr ch- chb chc chh chn cho chr cn- cnb cnc cnh cnn cno cnr co- cob coc coh con coo cor crb crc crh crn cro crr hbb hbc hbh hbn hbo hbr hcb hcc hch hcn hco hcr hhb hhc hhh hhn hho hhr hnb hnc hnh hnn hno hob hoc hoh hon hoo hor hr- hrb hrc hrh hrn hro hrr nbb nbc nbn nbo nbr ncb ncc nch ncn nco ncr nhb nhc nhh nhn nhr nnb nnc nnh nnn nno no- nob noc noh non noo nor nrb nrc nrn nro nrr ob- obb obc obh obn obo obr oc- ocb occ och ocn oco ocr ohc ohh ohn oho ohr on- onb onc onh onn ono onr oo- oob ooc ooh oon ooo oor or- orb orc orh orn oro orr rbb rbc rbh rbn rbo rbr rcb rcc rch rcn rco rcr rh- rhb rhc rhh rhn rho rhr rnb rnc rnh rnn rno rnr rob roc roh ron roo ror rrb rrc rrh rrn rrr