bbbb bbbs bblb bbls bffl bffs bfsi bfsr bibb bibi bibl bibo bibs biff bifi 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 boff bofs boi- boii boil bois boli boll bolo bols boob boof bool boor boos bor- borf bori boro borr bors bosi boso boss bril brio bris brls brob brol broo bror bros brrr brrs brsb brsr bsff bsfs bsos fbis fbrs ffff ffii ffrr ffss fibs fiff fifi fifo fiii fiil fili fill filo fils fior fios firs fisi fiss flii flis flob floo flor flos fobs fofo foil fois foli foll folo folr fols foof fool foos for- forb fori forl foro forr fors fosb fosi foso foss frib fril frio fris frob frol fros frsb frso fsfi fsfo fssf ibfi ibis ibos ibri ibro ibsf ibss ifbb ifil ifis ifor ifrb ifrf ifri ifsb ifso iiii iiio iiis iioi iioo iios iirs iisi iisr ilio ilir ilis ill- illi illo ills iloo ilos iobi ioii ioio iolo ioof iooi iooo ioos iori iors ioso iri- iril irio iris irlb irob irri irrs irsf isbl isil isis isls iso- isof isol isor isos isri issf issi isso issr isss lblr lbos lbrs libo libr libs liff lifl lifo 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 loff lofi loif loir lois loli loll lolo lols loob loof lool loor loos lori loro lors losi loso loss lrif lroi lrrr ls-r lsof lsso lssr obbo obis obls oboi obol obor obos obri obro obsr obss off- offo offr offs ofor oiii oils oios olbo olfs olib olio olis olli ollo olof olor olos olsi oobi ooff oofs oolo oooo ooos oosi orbb orbi orbo orbs orff orfi orfs ori- orif oril orio oris orlo oro- orof 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 rffl rib- ribo ribs riff rifs riif riis rill rilo riol rios riri rirs risi riso riss rlif rlls rob- robb robi robo robs roff rofl rofo roif roil roio roir rois rolf roll rolo roob roof rooi rool roor roos rori roro rosi roso ross rrif rrrr rsbi rsis rsos rssl s-ib s-ii s-os sbbs sbor sbsi sfio sfls sfor sfos sfro sfss sibi sibo sibs siff sifl sifo sifr sil- silf sili sill silo sils siol sior sios sirf siri siro sirr sirs sisi siss sl-i slib slir slob sloo slos slrs sobo sobr sobs sofi sofo soif soil soir sois solf soli soll solo solr sols soof sool soor soos sorb sori soro sorr sors sosi soso soss srfi srib sris sros ssbr ssfl ssis ssri ssrl ssrs sssb sssf sssi ssss