b-u bbb bbg bbk bbn bbo bbr bbs bbu bgb bgg bgk bgn bgo bgr bgs bgu bkb bkg bkk bkn bko bkr bks bnb bng bnk bnn bno bnr bns bnu bob bog bok bon boo bor bos bou brb brg brk brn bro brr brs bru bsb bsg bsk bsn bso bsr bss bsu bub bug buk bun buo bur bus buu gbg gbk gbn gbo gbr gbs gbu ggb ggg ggn ggo ggr ggs ggu gkb gkn gko gks gnb gnn gno gnr gns gnu gob gog gok gon goo gor gos gou grb grg grk grn gro grr grs gru gsb gsg gsk gsn gso gsr gss gsu gu- gub gug guk gun guo gur gus guu kbb kbk kbn kbo kbr kbs kbu kgb kgo kgs kgu kkb kkk kkn kkr kks kku kn- kng knk knn kno knr knu kob kog kok kon koo kor kos kou krg krk krn kro krr krs kru ksb ksg ksk ksn kso ksr kss ksu kub kug kuk kun kur kus kuu nbb nbg nbk nbn nbo nbr nbs nbu ngb ngg ngk ngn ngo ngs ngu nkk nkn nko nkr nks nku nnb nng nnk nnn nno nns nnu no- nob nog nok non noo nor nos nou nrb nrg nrk nrn nro nrr nrs nru nsb nsg nsk nsn nso nsr nss nsu nub nug nuk nun nuo nur nus nuu ob- obb obg obk obn obo obr obs obu ogg ogn ogo ogs okb okg okk oko okr oks oku on- onb ong onk onn ono onr ons onu oo- oob oog ook oon ooo oor oos or- orb org ork orn oro orr ors oru os- osb osg osk osn oso osr oss osu ou- ouk oun ouo our ous rbb rbg rbk rbn rbo rbr rbs rbu rgb rgg rgk rgn rgo rgr rgs rkb rkg rkk rko rks rku rnb rng rnn rno rnr rns rnu rob rog rok ron roo ror ros rou rrb rrg rrk rrn rrr rrs rru rsb rsg rsk rsn rso rsr rss rsu rub rug ruk run ruo rur rus ruu sbb sbg sbk sbn sbo sbr sbs sbu sgb sgg sgk sgn sgo sgr sgs sgu sk- skb skg skk sko skr sks sku snb sng snk snn sno snr sns snu sob sog sok son soo sor sos sou sr- srb srg srk srn sro srr srs ss- ssb ssg ssk ssn sso ssr sss ssu sub sug suk sun suo sur sus suu ubb ubg ubk ubn ubo ubr ubs ubu ugb ugg ugk ugn ugo ugr ugs ugu ukb ukk ukn ukr uku un- unb ung unk unn uno unr uns unu uob uog uok uon uoo uor uos ur- urb urg urk urn uro urr urs uru usb usg usk usn uso usr uss usu uug uun uur uus uuu