b-u bbb bbd bbk bbr bbu bby bdb bdd bdk bdr bdu bdy bkb bkk bkr brb brd brk brr bru bry bub bud buk bur buu buy by- byd byk byr byu dbb dbd dbk dbr dbu dby ddb ddd ddk ddr ddu ddy dkb dkk dkr dku drb drd drk drr dru dry dub dud duk dur duy dy- dyb dyd dyk dyr dyu dyy kbb kbd kbk kbr kbu kdb kdk kdr kdu kdy kkb kkk kkr kku kky krd krk krr kru kry kub kud kuk kur kuu kuy kyd kyr kyu rbb rbd rbk rbr rbu rdb rdd rdr rdu rdy rkb rkk rku rky rrb rrd rrk rrr rru rub rud ruk rur ruu ruy ry- ryd ryk ryr ryu ryy ubb ubk ubr ubu uby udb udd udk udr udu ukb ukk ukr uku ur- urb urd urk urr uru ury uur uuu uyu ybr yby ydy ykk yru yud yuk yur yuu yuy yyb yyu yyy