b-u bbb bbd bbk bbn bbr bbs bbu bdb bdd bdk bdr bds bdu bkb bkk bkn bkr bks bnb bnd bnk bnn bnr bns bnu brb brd brk brn brr brs bru bsb bsd bsk bsn bsr bss bsu bub bud buk bun bur bus buu dbb dbd dbk dbn dbr dbs dbu ddb ddd ddk ddn ddr dds ddu dkb dkk dkr dks dku dnb dnd dnk dnn dnr dns drb drd drk drn drr drs dru dsb dsd dsk dsn dsr dss dsu dub dud duk dun dur dus kbb kbd kbk kbn kbr kbs kbu kdb kdk kdr kds kdu kkb kkk kkn kkr kks kku kn- knd knk knn knr knu krd krk krn krr krs kru ksb ksd ksk ksn ksr kss ksu kub kud kuk kun kur kus kuu nbb nbd nbk nbn nbr nbs nbu ndb ndd ndk ndn ndr nds ndu nkk nkn nkr nks nku nnb nnk nnn nns nnu nrb nrd nrk nrn nrr nrs nru nsb nsd nsk nsn nsr nss nsu nub nud nuk nun nur nus nuu rbb rbd rbk rbn rbr rbs rbu rdb rdd rdn rdr rds rdu rkb rkk rks rku rnb rnd rnn rnr rns rnu rrb rrd rrk rrn rrr rrs rru rsb rsd rsk rsn rsr rss rsu rub rud ruk run rur rus ruu sbb sbd sbk sbn sbr sbs sbu sdb sdd sdk sdn sdr sds sdu sk- skb skd skk skr sks sku snb snd snk snn snr sns snu sr- srb srd srk srn srr srs ss- ssb ssd ssk ssn ssr sss ssu sub sud suk sun sur sus suu ubb ubk ubn ubr ubs ubu udb udd udk udn udr uds udu ukb ukk ukn ukr uku un- unb und unk unn unr uns unu ur- urb urd urk urn urr urs uru usb usd usk usn usr uss usu uun uur uus uuu