b-u bbb bbd bbo bbr bbs bbt bbu bby bdb bdd bdo bdr bds bdt bdu bdy bob bod boo bor bos bot bou boy brb brd bro brr brs brt bru bry bsb bsd bso bsr bss bst bsu bsy btb btd bto btr bts btt btu bty bub bud buo bur bus but buu buy by- byd byo byr bys byt byu dbb dbd dbo dbr dbs dbt dbu dby ddb ddd ddo ddr dds ddt ddu ddy dob dod doo dor dos dot dou doy drb drd dro drr drs drt dru dry dsb dsd dso dsr dss dst dsu dsy dtb dtd dto dtr dts dtt dtu dty dub dud duo dur dus dut duy dy- dyb dyd dyo dyr dys dyu dyy ob- obb obd obo obr obs obt obu oby odb odd odo odr ods odt odu oo- oob ood ooo oor oos oot or- orb ord oro orr ors ort oru ory os- osb osd oso osr oss ost osu ot- otb otd oto otr ots ott otu ou- oud ouo our ous out oyd oyo oys rbb rbd rbo rbr rbs rbt rbu rdb rdd rdo rdr rds rdt rdu rdy rob rod roo ror ros rot rou roy rrb rrd rrr rrs rrt rru rsb rsd rso rsr rss rst rsu rtb rtd rto rtr rts rtt rtu rty rub rud ruo rur rus rut ruu ruy ry- ryd ryo ryr rys ryu ryy sbb sbd sbo sbr sbs sbt sbu sby sdb sdd sdo sdr sds sdt sdu sdy sob sod soo sor sos sot sou soy sr- srb srd sro srr srs srt sry ss- ssb ssd sso ssr sss sst ssu stb std sto str sts stt stu sty sub sud suo sur sus sut suu suy sy- syb syd syr sys syt syu tbb tbd tbo tbr tbs tbt tbu tdb tdd tdo tdr tds tdt tdu tdy to- tob tod too tor tos tot tou toy trb trd tro trr trs trt tru try tsb tsd tso tsr tss tst tsu tsy ttb ttd tto ttr tts ttt ttu tty tub tud tuo tur tus tut tuu tuy tyd tyo tyr tys tyt ubb ubo ubr ubs ubt ubu uby udb udd udo udr uds udt udu uob uod uoo uor uos uot ur- urb urd uro urr urs urt uru ury usb usd uso usr uss ust usu utb utd uto utr uts utt utu uty uur uus uut uuu uyo uys uyu ybr ybs yby ydo yds ydt ydy yob yod yoo yor yos yot you yoy yro yrs yrt yru ysb yso ysr yss yst ysu ysy ytd yto ytr yts ytt ytu yud yuo yur yus yut yuu yuy yyb yys yyt yyu yyy