bbbb bbin bbpr bibb bibi bibo biin bin- bini binn bino binu bio- bioi bion biou bipp bipu birb biri birn biro birr biru bnib bnin bnor bnpp bnrr bobb bobi bobo bobu boi- boii boin boiu boni bonn bono bonu boob boon boop boor bopp bor- bori born boro borr boru boun boup bour brin brio brno brob bron broo bror brou brrr brun brup bubb bubi bubo bubu buin buir buiu bunb buni bunn buno bunu buon bur- burb buri burn buro burp burr buru i-no ibon ibri ibro iiii iiio iino iioi iioo iiop inbo inni inno innr innu ino- inoi inon inor inou inp- inpi inpp inri inro inui inun inup iobi ioii ioio ioni ionn iono iooi iooo iori ioun ipin ipop ippo ippr ipri ipur irbp iri- irin irio irip irob iron irop irri irun iuiu iuno iupp n-ii n-up nbbo nbpp nibi nibo niip niir niiu nini nino nion nioo niou nipr niro niru niur nnnn nnpi nnpr nobi nobo nobu noib noin noio noir non- noni nonn nono nonu noo- noob noon nooo noop noor nor- norb nori norn noro norr noun noup nour npin npri nron nrpn nubi nuin nunn nuno nuon nuri nurn nurp nurr nuru obbo obin oboi obon obor obri obro oiii oion onir onni onno onon onor onpu onup onur oobi oooo opii opin opio opo- opon opor oppi oppo orbb orbi orbo orbu ori- orin orio orni orno oro- oron oror orpi orri orro orub orup ouii ouin ouir oun- our- ourn ouro ouu- pibb pibi piip pini pinn pino pinp pinu piob pion pipi pipo pipp piri pirn piro pirr piru pnin pnon pnpo pnpp pnro pnup pobo poin poio poni pono ponp poon poop poor pop- popi popo popp porb pori porn poro porr poui poun poup pour ppib pppn pppo pppp ppru ppur pri- prii prin prnp pro- prob pron proo prop prou prri pruu pubu puin puir puiu puno punu pupi pupu pur- purb puri puro purp purr puru rbbb rbbr rib- ribo ribu riin rinn rino rion riou ripi ripp ripr riri rnbr rnin rob- robb robi robo robu roin roio roir roiu roni rono roob rooi roon roop roor ropo rori roro roru roub roun roup rpii rpob rpon rppn rrrr rrun rubb rubi rubp rubu ruin runi runn runo rupp ruri ruro rurp ruru ruun u-rp ubbi ubbo ubii ubir ubon uipi uirr uni- unii unin unio unir unni unno unon unop unro uor- upin upnp upon upor uppp uppu upri upup urbi urib urin uriu urni uro- uroo urpo urri urun urup urur uuni uuno uuri uuuu