bbb bbd bbk bbn bbo bbr bbs bdb bdd bdk bdo bdr bds bkb bkk bkn bko bkr bks bnb bnd bnk bnn bno bnr bns bob bod bok bon boo bor bos brb brd brk brn bro brr brs bsb bsd bsk bsn bso bsr bss dbb dbd dbk dbn dbo dbr dbs ddb ddd ddk ddn ddo ddr dds dkb dkk dko dkr dks dnb dnd dnk dnn dno dnr dns dob dod dok don doo dor dos drb drd drk drn dro drr drs dsb dsd dsk dsn dso dsr dss kbb kbd kbk kbn kbo kbr kbs kdb kdk kdo kdr kds kkb kkk kkn kkr kks kn- knd knk knn kno knr kob kod kok kon koo kor kos krd krk krn kro krr krs ksb ksd ksk ksn kso ksr kss nbb nbd nbk nbn nbo nbr nbs ndb ndd ndk ndn ndo ndr nds nkk nkn nko nkr nks nnb nnk nnn nno nns no- nob nod nok non noo nor nos nrb nrd nrk nrn nro nrr nrs nsb nsd nsk nsn nso nsr nss ob- obb obd obk obn obo obr obs odb odd odn odo odr ods okb okd okk oko okr oks on- onb ond onk onn ono onr ons oo- oob ood ook oon ooo oor oos or- orb ord ork orn oro orr ors os- osb osd osk osn oso osr oss rbb rbd rbk rbn rbo rbr rbs rdb rdd rdn rdo rdr rds rkb rkk rko rks rnb rnd rnn rno rnr rns rob rod rok ron roo ror ros rrb rrd rrk rrn rrr rrs rsb rsd rsk rsn rso rsr rss sbb sbd sbk sbn sbo sbr sbs sdb sdd sdk sdn sdo sdr sds sk- skb skd skk sko skr sks snb snd snk snn sno snr sns sob sod sok son soo sor sos sr- srb srd srk srn sro srr srs ss- ssb ssd ssk ssn sso ssr sss