bbbb bbbs bbin bibb bibi bibo bibs biin biis bin- bini binn bino bins bio- bioi bion bios birb biri birn biro birr birs bis- biso biss bivi bnib bnin bnor bnrr bnss bobb bobi bobo bobs boi- boii boin bois boni bonn bono bons boob boon boor boos bor- bori born boro borr bors bosi bosn boso boss bovi bovo brin brio bris brno brns brob bron broo bror bros brrr brrs brsb brsr brvi bsin bsns bson bsos i-no ibis ibns ibon ibos ibri ibro ibsn ibss iiii iiio iiis iino iioi iioo iios iirs iisi iisr inbo inis inni inno innr inns ino- inoi inon inor inos inri inro inrs inso inss invs iobi ioii ioio ioni ionn iono ions iooi iooo ioos iori iors ioso iri- irin irio iris irob iron irov irri irrs irvs isbn isin isis isno iso- ison isor isos isri issi isso issr isss ivbv ivin ivon ivor ivrs n-ii nbbo nibi nibo nibs niir nini nino nins nion nioo nios niro nirs nirv nisi niso niss nivo nivr nnnn nnos nnss nobi nobo nobs noib noin noio noir nois non- noni nonn nono nons noo- noob noon nooo noor noos noov nor- norb nori norn noro norr nors norv nos- noss nov- novi novo nron nrsv nsbo nsin nsis nsnr nsos nssb nsso nssr nsss nvir nvis nvss obbo obin obis oboi obon obor obos obri obro obsn obsr obss obvi obvs oiii oins oion oios onir onis onni onno onon onor onos onso oobi oons oooo ooos oosi orbb orbi orbo orbs ori- orin orio oris orni orno orns oro- oron oror oros orri orro orrs orsi orso orvr orvs osii osin osis osno osnr osoi osoo osor osos osov osro ossb ossi osso ovi- ovis ovni ovo- ovon ovoo rbbb rbbr rbbs rbis rbss rib- ribo ribs riin riis rinn rino rion rios riri rirs risi riso riss rivo rivs rnbr rnin rob- robb robi robo robs roin roio roir rois roni rono rons roob rooi roon roor roos rori roro rosi roso ross rovi rovo rovs rrrr rsbi rsis rsnn rsno rsnr rsos s-ib s-ii s-iv s-os sbbs sbor sbsi sibi sibo sibs sini sinn sino sins sion sior sios siri siro sirr sirs sisi siss sivi snib snir snns snob snoo snor snos snov snrs snvi sobo sobr sobs soin soir sois son- soni sono sons soon soor soos sorb sori sorn soro sorr sors sosi soso soss sosv sovo sovs srib sris srni srnn srno sros srvn ssbn ssbr ssin ssis ssns ssri ssrs sssb sssi ssss svir svns svor vibs viii vini vino vins vion vios virb viri viro virr visi visn viso viss vivi vivo vnir vnso voin voio voir vois voni vonn vons voor vor- vori voro vors vosi voso voss vrin vrio vris vrnn vron vrsi vvob vvsb vvvv