bbb bbc bbh bbn bbo bbr bbs bcb bcc bch bcn bco bcr bcs bhb bhc bhh bho bhr bhs bnb bnc bnn bno bnr bns bob boc boh bon boo bor bos brb brh brn bro brr brs bsb bsc bsh bsn bso bsr bss c-- cbb cbc cbh cbn cbo cbr cbs ccb ccc cch ccn cco ccr ccs ch- chb chc chh chn cho chr chs cn- cnb cnc cnh cnn cno cnr cns co- cob coc coh con coo cor cos crb crc crh crn cro crr crs csb csc csh csn cso csr css hbb hbc hbh hbn hbo hbr hbs hcb hcc hch hcn hco hcr hcs hhb hhc hhh hhn hho hhr hhs hnb hnc hnh hnn hno hns hob hoc hoh hon hoo hor hos hr- hrb hrc hrh hrn hro hrr hrs hsb hsc hsh hsn hsr hss nbb nbc nbn nbo nbr nbs ncb ncc nch ncn nco ncr ncs nhb nhc nhh nhn nhr nhs nnb nnc nnh nnn nno nns no- nob noc noh non noo nor nos nrb nrc nrn nro nrr nrs nsb nsc nsh nsn nso nsr nss ob- obb obc obh obn obo obr obs oc- ocb occ och ocn oco ocr ocs ohc ohh ohn oho ohr ohs on- onb onc onh onn ono onr ons oo- oob ooc ooh oon ooo oor oos or- orb orc orh orn oro orr ors os- osb osc osh osn oso osr oss rbb rbc rbh rbn rbo rbr rbs rcb rcc rch rcn rco rcr rcs rh- rhb rhc rhh rhn rho rhr rhs rnb rnc rnh rnn rno rnr rns rob roc roh ron roo ror ros rrb rrc rrh rrn rrr rrs rsb rsc rsh rsn rso rsr rss sbb sbc sbh sbn sbo sbr sbs scb scc sch scn sco scr scs sh- shb shc shh shn sho shr shs snb snc snn sno snr sns sob soc soh son soo sor sos sr- srb src srh srn sro srr srs ss- ssb ssc ssh ssn sso ssr sss