bbbb bbin bibb bibi bibo biin bin- bini binn bino bio- bioi bion birb biri birn biro birr bnib bnin bnor bnrr bobb bobi bobo boi- boii boin boni bonn bono boob boon boor bor- bori born boro borr brin brio brno brob bron broo bror brrr 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 irri n-ii nbbo nibi nibo niir nini nino nion nioo niro nnnn nobi nobo noib noin noio noir non- noni nonn nono noo- noob noon nooo noor nor- norb nori norn noro norr nron obbo obin oboi obon obor obri obro oiii oion onir onni onno onon onor oobi oooo orbb orbi orbo ori- orin orio orni orno oro- oron oror orri orro rbbb rbbr rib- ribo riin rinn rino rion riri rnbr rnin rob- robb robi robo roin roio roir roni rono roob rooi roon roor rori roro rrrr