bbbb bbin bibb bibi bibo biin bin- bini binn bino bio- bioi bion birb biri birn biro birr bivi bnib bnin bnor bnrr bobb bobi bobo boi- boii boin boni bonn bono boob boon boor bor- bori born boro borr bovi bovo brin brio brno brob bron broo bror brrr brvi i-no ibon ibri ibro iiii iiio iino iioi iioo inbo inni inno innr ino- inoi inon inor inri inro iobi ioii ioio ioni ionn iono iooi iooo iori iri- irin irio irob iron irov irri ivbv ivin ivon ivor n-ii nbbo nibi nibo niir nini nino nion nioo niro nirv nivo nivr nnnn nobi nobo noib noin noio noir non- noni nonn nono noo- noob noon nooo noor noov nor- norb nori norn noro norr norv nov- novi novo nron nvir obbo obin oboi obon obor obri obro obvi oiii oion onir onni onno onon onor oobi oooo orbb orbi orbo ori- orin orio orni orno oro- oron oror orri orro orvr ovi- ovni ovo- ovon ovoo rbbb rbbr rib- ribo riin rinn rino rion riri rivo rnbr rnin rob- robb robi robo roin roio roir roni rono roob rooi roon roor rori roro rovi rovo rrrr viii vini vino vion virb viri viro virr vivi vivo vnir voin voio voir voni vonn voor vor- vori voro vrin vrio vrnn vron vvob vvvv