b-u bbb bbm bbo bbr bbu bby bmb bmm bmo bmr bmu bob bom boo bor bou boy brb brm bro brr bru bry bub bum buo bur buu buy by- bym byo byr byu m-o m-r mbb mbm mbo mbr mbu mmb mmm mmo mmr mmu mob mom moo mor mou moy mrb mrm mro mrr mru mry mub mum mur muu muy my- myb mym myo myr myu ob- obb obm obo obr obu oby om- omb omm omo omr omu omy oo- oob oom ooo oor or- orb orm oro orr oru ory ou- oum ouo our oyo rbb rbm rbo rbr rbu rmb rmm rmo rmr rob rom roo ror rou roy rrb rrm rrr rru rub rum ruo rur ruu ruy ry- rym ryo ryr ryu ryy ubb ubo ubr ubu uby um- umb umm umo umr umu uob uom uoo uor ur- urb urm uro urr uru ury uum uur uuu uyo uyu ybm ybr yby ymm ymo yob yom yoo yor you yoy yro yru yum yuo yur yuu yuy yyb yyu yyy