bbbb bbin bbpr bibb bibi bibo biin bin- bini binn bino bio- bioi bion bipp birb biri birn biro birr bivi bnib bnin bnor bnpp bnrr bobb bobi bobo boi- boii boin boni bonn bono boob boon boop boor bopp bor- bori born boro borr bovi bovo brin brio brno brob bron broo bror brrr brvi 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 irov irri ivbv ivin ivon ivor n-ii nbbo nbpp nibi nibo niip niir nini nino nion nioo nipr niro nirv nivo nivr nnnn nnpi nnpr nobi nobo noib noin noio noir non- noni nonn nono noo- noob noon nooo noop noor noov nor- norb nori norn noro norr norv nov- novi novo npin npiv npov npri nron nrpn nvir nvpi obbo obin oboi obon obor obri obro obvi 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 orvr ovi- ovni ovo- ovon ovoo ovpp pibb pibi piip pini pinn pino pinp piob pion pipi pipo pipp piri pirn piro pirr pivo pnin pnon pnpo pnpp pnro pobo poin poio poni pono ponp poon poop poor pop- popi popo popp porb pori porn poro porr povo ppbv ppib pppn pppo pppp pri- prii prin priv prnp pro- prob pron proo prop prov prri rbbb rbbr rib- ribo riin rinn rino rion ripi ripp ripr riri rivo rivp rnbr rnin rnpv rob- robb robi robo roin roio roir roni rono roob rooi roon roop roor ropo rori roro rovi rovo rpii rpob rpon rppn rrrr viii vini vino vion vipr virb viri viro virr vivi vivo vnir voin voio voip voir voni vonn voor vor- vori voro vpon vpro vrin vrio vrnn vron vrpn vvob vvpb vvvv