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 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 brin brio bris brno brns brob bron broo bror bros brrr brrs brsb brsr 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 iobi ioii ioio ioni ionn iono ions iooi iooo ioos iori iors ioso iri- irin irio iris irob iron irri irrs isbn isin isis isno iso- ison isor isos isri issi isso issr isss n-ii nbbo nibi nibo nibs niir nini nino nins nion nioo nios niro nirs nisi niso niss nnnn nnos nnss nobi nobo nobs noib noin noio noir nois non- noni nonn nono nons noo- noob noon nooo noor noos nor- norb nori norn noro norr nors nos- noss nron nsbo nsin nsis nsnr nsos nssb nsso nssr nsss obbo obin obis oboi obon obor obos obri obro obsn obsr obss 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 osii osin osis osno osnr osoi osoo osor osos osro ossb ossi osso rbbb rbbr rbbs rbis rbss rib- ribo ribs riin riis rinn rino rion rios riri rirs risi riso riss rnbr rnin rob- robb robi robo robs roin roio roir rois roni rono rons roob rooi roon roor roos rori roro rosi roso ross rrrr rsbi rsis rsnn rsno rsnr rsos s-ib s-ii s-os sbbs sbor sbsi sibi sibo sibs sini sinn sino sins sion sior sios siri siro sirr sirs sisi siss snib snir snns snob snoo snor snos snrs sobo sobr sobs soin soir sois son- soni sono sons soon soor soos sorb sori sorn soro sorr sors sosi soso soss srib sris srni srnn srno sros ssbn ssbr ssin ssis ssns ssri ssrs sssb sssi ssss