bbbb bbin bbpr bibb bibi bibo biin bin- bini binn bino binz bio- bioi bion bipp birb biri birn biro birr bizz bnib bnin bnor bnpp bnrr bobb bobi bobo boi- boii boin boni bonn bono boob boon boop boor booz bopp bor- bori born boro borr borz bozi bozo brin brio briz brno brob bron broo bror broz brrr bzip bzzz i-no ibon ibri ibro iiii iiio iino iioi iioo iiop inbo inni inno innr ino- inoi inon inor inoz inp- inpi inpp inri inro iobi ioii ioio ioni ionn iono iooi iooo iori ipin ipop ippo ippr ipri irbp iri- irin irio irip irob iron irop irri izon izzo n-ii nbbo nbpp nibi nibo niip niir nini nino nion nioo nipr niro nnnn nnpi nnpr nobi nobo noib noin noio noir non- noni nonn nono noo- noob noon nooo noop noor nor- norb nori norn noro norr nozi npin npri nron nrpn nzpi nzpp nzrb obbo obin oboi obon obor obri obro oiii oion onir onni onno onon onor onoz onzo oobi oooo oozi opii opin opio opo- opon opor oppi oppo orbb orbi orbo ori- orin orio orni orno oro- oron oror oroz orpi orri orro orzo ozon pibb pibi piip pini pinn pino pinp piob pion pioz pipi pipo pipp piri pirn piro pirr pnin pnon pnpo pnpp pnro pobo poin poio poni pono ponp poon poop poor pop- popi popo popp porb pori porn poro porr porz pozo ppib pppn pppo pppp pri- prii prin prnp pro- prob pron proo prop proz prri rbbb rbbr rib- ribo riin rinn rino rion rioz ripi ripp ripr riri rizi rizz rnbr rnin rob- robb robi robo roin roio roir roiz roni rono roob rooi roon roop roor rooz ropo rori roro rozi rozz rpii rpob rpon rppn rrrr rzip z-ro zibo ziip zinn zino zion zipp ziri ziro zirp zizi zizz zobo zoio zon- zoni zoo- zoon zoop zorb zori zorn zoro zozo zrin zzzz