bbbb bbin bibb bibi bibo biin bin- bini binn bino bint bio- bioi bion biot birb biri birn biro birr birt bito bitt bnib bnin bnor bnrr bobb bobi bobo boi- boii boin boit boni bonn bono bont boob boon boor boot bor- bori born boro borr bort botb boti botn boto bott brin brio brit brno brob bron broo bror brot brrr btob btor btrt bttb i-no ibon ibot ibri ibro ibtb iiii iiio iiit iino iioi iioo iitr iitt inbo init inni inno innr ino- inoi inon inor inot inri inro inti intn into intr iobi ioii ioio ioit ioni ionn iono iooi iooo iori ioto iri- irin irio irob iron irri irti itin itno itoi iton itoo itor itri itto n-ii nbbo nbti nibi nibo niir niit nini nino nion nioo niro nirt nitb niti nito nitr nnit nnnn nnot nntn nobi nobo noib noin noio noir noit non- noni nonn nono nont noo- noob noon nooo noor noot nor- norb nori norn noro norr nort not- noti noto nott nron ntto nttr obbo obin obit oboi obon obor obot obri obro oiii oint oion oirt oiti onir onit onni onno onon onor ont- onti onto oobi oont oooo oort ootb orbb orbi orbo ori- orin orio orit orni orno oro- oron oror orot orri orro orto otin otit oto- oton otoo otor otro otti otto rbbb rbbr rib- ribo riin rinn rino rion riot riri riti rito ritt rnbr rnin rnnt rnot rob- robb robi robo robt roin roio roir roit roni rono ront roob rooi roon roor root rori roro rort roti rotn roto rotr rott rrrr tbit tbrb tibi tiit tini tinn tino tint tion tirb tiri tiro tirr titi tito titt tobi tobo tobt toit tonb toni tonn tono toon toor toot tori torn toro torr tort toti toto totr tott tri- trib trin trio trit trno troi tron troo trot trtr ttbb tton tttt