bbbb bbin bbox bibb bibi bibo biin bin- bini binn bino bio- bioi bion biox birb biri birn biro birr birx bixi bnib bnin bnor bnrr bobb bobi bobo boi- boii boin boni bonn bono boob boon boor boox bor- bori born boro borr brin brio brix brno brob bron broo bror brox brrr i-no ibon ibox ibri ibro iiii iiio iino iioi iioo inbo inni inno innr ino- inoi inon inor inox inri inro iobi ioii ioio ioni ionn iono iooi iooo iori iri- irin irio irix irob iron irri ixxi n-ii nbbo nibi nibo niir nini nino nion nioo niro nixi nnnn nobi nobo noib noin noio noir noix non- noni nonn nono nonx noo- noob noon nooo noor nor- norb nori norn noro norr nron obbo obin obix oboi obon obor obox obri obro oiii oion onir onix onni onno onon onor oobi oooo orbb orbi orbo ori- orin orio orix orni orno oro- oron oror orri orro oxi- oxo- oxon oxox oxxo rbbb rbbr rib- ribo riin rinn rino rion riri rixo rnbr rnin rob- robb robi robo roin roio roir roni rono roob rooi roon roor roox rori roro roxo rrrr xbin xbox xibo xiii xion xixi xorn xoro xoxo xxii xxix xxxi xxxo xxxx