b-u bbb bbn bbr bbs bbt bbu bby bnb bnn bnr bns bnt bnu brb brn brr brs brt bru bry bsb bsn bsr bss bst bsu bsy btb btn btr bts btt btu bty bub bun bur bus but buu buy by- byn byr bys byt byu nbb nbn nbr nbs nbt nbu nnb nnn nns nnt nnu nrb nrn nrr nrs nrt nru nry nsb nsn nsr nss nst nsu nsy ntb ntn ntr nts ntt ntu nub nun nur nus nut nuu nuy nyn nys nyt nyu nyy rbb rbn rbr rbs rbt rbu rnb rnn rnr rns rnt rnu rny rrb rrn rrr rrs rrt rru rsb rsn rsr rss rst rsu rtb rtn rtr rts rtt rtu rty rub run rur rus rut ruu ruy ry- ryn ryr rys ryu ryy sbb sbn sbr sbs sbt sbu sby snb snn snr sns snt snu sny sr- srb srn srr srs srt sry ss- ssb ssn ssr sss sst ssu stb stn str sts stt stu sty sub sun sur sus sut suu suy sy- syb syn syr sys syt syu tbb tbn tbr tbs tbt tbu tnb tnn tnr tns tnt trb trn trr trs trt tru try tsb tsn tsr tss tst tsu tsy ttb ttn ttr tts ttt ttu tty tub tun tur tus tut tuu tuy tyn tyr tys tyt ubb ubn ubr ubs ubt ubu uby un- unb unn unr uns unt unu uny ur- urb urn urr urs urt uru ury usb usn usr uss ust usu utb utn utr uts utt utu uty uun uur uus uut uuu uys uyu ybr ybs yby ynn yns ynu yny yrn yrs yrt yru ysb ysr yss yst ysu ysy ytn ytr yts ytt ytu yun yur yus yut yuu yuy yyb yys yyt yyu yyy