bbbb bbin bbpr bibb bibi bibo biin bin- bini binn bino bio- bioi bion bipp birb biri birn biro birr bnib bnin bnor bnpp bnrr bobb bobi bobo boi- boii boin boni bonn bono boob boon boop boor bopp bor- bori born boro borr brin brio brno brob bron broo bror brrr i-no ibon ibri ibro iiii iiio iino iioi iioo iiop inbo inni inno innr ino- inoi inon inor 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 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 npin npri nron nrpn obbo obin oboi obon obor obri obro oiii oion onir onni onno onon onor oobi oooo opii opin opio opo- opon opor oppi oppo orbb orbi orbo ori- orin orio orni orno oro- oron oror orpi orri orro pibb pibi piip pini pinn pino pinp piob pion 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 ppib pppn pppo pppp pri- prii prin prnp pro- prob pron proo prop prri rbbb rbbr rib- ribo riin rinn rino rion ripi ripp ripr riri rnbr rnin rob- robb robi robo roin roio roir roni rono roob rooi roon roop roor ropo rori roro rpii rpob rpon rppn rrrr