b-u bbb bbd bbk bbo bbr bbu bby bdb bdd bdk bdo bdr bdu bdy bkb bkk bko bkr bob bod bok boo bor bou boy brb brd brk bro brr bru bry bub bud buk buo bur buu buy by- byd byk byo byr byu dbb dbd dbk dbo dbr dbu dby ddb ddd ddk ddo ddr ddu ddy dkb dkk dko dkr dku dob dod dok doo dor dou doy drb drd drk dro drr dru dry dub dud duk duo dur duy dy- dyb dyd dyk dyo dyr dyu dyy kbb kbd kbk kbo kbr kbu kdb kdk kdo kdr kdu kdy kkb kkk kkr kku kky kob kod kok koo kor kou koy krd krk kro krr kru kry kub kud kuk kur kuu kuy kyd kyo kyr kyu ob- obb obd obk obo obr obu oby odb odd odo odr odu okb okd okk oko okr oku oo- oob ood ook ooo oor or- orb ord ork oro orr oru ory ou- oud ouk ouo our oyd oyo rbb rbd rbk rbo rbr rbu rdb rdd rdo rdr rdu rdy rkb rkk rko rku rky rob rod rok roo ror rou roy rrb rrd rrk rrr rru rub rud ruk ruo rur ruu ruy ry- ryd ryk ryo ryr ryu ryy ubb ubk ubo ubr ubu uby udb udd udk udo udr udu ukb ukk ukr uku uob uod uok uoo uor ur- urb urd urk uro urr uru ury uur uuu uyo uyu ybr yby ydo ydy ykk yob yod yok yoo yor you yoy yro yru yud yuk yuo yur yuu yuy yyb yyu yyy