bbb bbd bbf bbn bbo bbr bbs bdb bdd bdf bdo bdr bds bfb bfd bff bfn bfo bfr bfs bnb bnd bnf bnn bno bnr bns bob bod bof bon boo bor bos brb brd brf brn bro brr brs bsb bsd bsf bsn bso bsr bss dbb dbd dbf dbn dbo dbr dbs ddb ddd ddf ddn ddo ddr dds dfb dfd dff dfn dfo dfr dfs dnb dnd dnf dnn dno dnr dns dob dod dof don doo dor dos drb drd drn dro drr drs dsb dsd dsf dsn dso dsr dss fbb fbd fbf fbn fbo fbr fbs fdb fdd fdf fdn fdo fdr fds ffd fff ffn ffo ffr ffs fnb fnd fnf fnn fnr fns fob fof fon foo for fos frb frd frf frn fro frr frs fsb fsd fsf fsn fso fsr fss nbb nbd nbf nbn nbo nbr nbs ndb ndd ndf ndn ndo ndr nds nfb nfd nff nfn nfo nfr nfs nnb nnf nnn nno nns no- nob nod nof non noo nor nos nrb nrd nrf nrn nro nrr nrs nsb nsd nsf nsn nso nsr nss ob- obb obd obf obn obo obr obs odb odd odf odn odo odr ods of- ofb ofd off ofn ofo ofr ofs on- onb ond onf onn ono onr ons oo- oob ood oof oon ooo oor oos or- orb ord orf orn oro orr ors os- osb osd osf osn oso osr oss rbb rbd rbf rbn rbo rbr rbs rdb rdd rdf rdn rdo rdr rds rfb rfd rff rfn rfo rfr rfs rnb rnd rnn rno rnr rns rob rod rof ron roo ror ros rrb rrd rrf rrn rrr rrs rsb rsd rsf rsn rso rsr rss sbb sbd sbf sbn sbo sbr sbs sdb sdd sdf sdn sdo sdr sds sfb sfd sff sfn sfo sfr sfs snb snd snf snn sno snr sns sob sod sof son soo sor sos sr- srb srd srf srn sro srr srs ss- ssb ssd ssf ssn sso ssr sss