bibbo bibin bibio bibri binub birin birni biron birou birun birur bo-bo bobbi bobin bobr bobri boiro bonin bonio bonon bonou boorn booru borbo borin borio born- borno bornu boro- boron boroo borou borro borun bouin bouni bouri bourn brini brinn brion briou brobo broin broni bronn broon broun brrrr bruin bruiu bruni brunn bruno bruri bruun bubon buirn bunin bunun buono burin burio burn- buron buroo burri burro burru burun i-bon ibbur ibibo iborn iiiii iiuni inbin inini inio inio- inion inniu inonu inoor inorb inori inour inrio inrun inurn iono- ioooi ioooo iorio irinn irion irobo irono irori irour iunno nibbi niibi ninib ninon ninur niono nioro nnooo no-no nobin nobob nobuo non-u nonin nonio nonni nonno noonu noori norbu norin norio noron norro norun nouni nouri nu-nu nunni nunon nunun nuoro nurin nurri nurun o-bon o-r-b obion oboro oino- oinoi oiron onibi onin onion onir- oniro onoon onorn onour onrio ooioo oonin ooooo oribi orino orion orni- ornon orobo orono orrin oruro ouir- ouoro ourno ribbi ribin ribno ribo- ribon rioni ro-ro robbi robbo robin robo- robon robor robun robur ronin ronno rorbu rubbi rubin rubio rubon rubor ruino ruiru runin runo- runon u-n-i u-nii ubirr ubobo uiro unini uninn union unnun unnur unoor unorn unrun unurn urin- uroob urour urubu ururi uuuuu