bbbb bbbs bblb bbls bibb bibi bibl bibo bibs biis bili bill bilo bils bio- bioi biol bios birb biri birl biro birr birs bis- bisl biso biss blio blir blis blls blob bloo blss bobb bobi bobo bobs boi- boii boil bois boli boll bolo bols boob bool boor boos bor- bori boro borr bors bosi boso boss bril brio bris brls brob brol broo bror bros brrr brrs brsb brsr bsos ibis ibos ibri ibro ibss iiii iiio iiis iioi iioo iios iirs iisi iisr ilio ilir ilis ill- illi illo ills iloo ilos iobi ioii ioio iolo iooi iooo ioos iori iors ioso iri- iril irio iris irlb irob irri irrs isbl isil isis isls iso- isol isor isos isri issi isso issr isss lblr lbos lbrs libo libr libs liii liir liis lilb lili lill lilo lils lio- lior lios liri lirl liro lirr lirs lisi liso liss llbs llll lloo lob- lobb lobi lobo lobs loir lois loli loll lolo lols loob lool loor loos lori loro lors losi loso loss lroi lrrr ls-r lsso lssr obbo obis obls oboi obol obor obos obri obro obsr obss oiii oils oios olbo olib olio olis olli ollo olor olos olsi oobi oolo oooo ooos oosi orbb orbi orbo orbs ori- oril orio oris orlo oro- oror oros orri orro orrs orsi orso osii osis osli oslo osoi osoo osor osos osro ossb ossi osso rbbb rbbr rbbs rbis rbsl rbss rib- ribo ribs riis rill rilo riol rios riri rirs risi riso riss rlls rob- robb robi robo robs roil roio roir rois roll rolo roob rooi rool roor roos rori roro rosi roso ross rrrr rsbi rsis rsos rssl s-ib s-ii s-os sbbs sbor sbsi sibi sibo sibs sil- sili sill silo sils siol sior sios siri siro sirr sirs sisi siss sl-i slib slir slob sloo slos slrs sobo sobr sobs soil soir sois soli soll solo solr sols sool soor soos sorb sori soro sorr sors sosi soso soss srib sris sros ssbr ssis ssri ssrl ssrs sssb sssi ssss