-ous bbbb bbbs bblb bbls bffl bffs bfsr bfts bftt blbt blls blob bloo blot blou blss blst blts blub bluf blur blus blut bobb bobo bobs bobu boff bofs bofu boll bolo bols bolt bolu boob boof bool boor boos boot bor- borf boro borr bors bort boru boso boss bost bosu botb boto bots bott bouf boul bour bous bout brfu brls brob brol broo bror bros brot brou brrr brrs brsb brsr brst brus brut bsff bsfs bsos bsts btob btor btrt btss bttb btus bubb bubo bubs bubu buff bufo bufr bulb bull buls bult bulu buol bur- burb burl buro burr burs burt buru buss bust busu but- buto buts butt buus fbrs fbus ffff ffrr ffss fftf flob floo flor flos flot flou flts flub fluf fluo flur flus fobs fobt fofo foll folo folr fols folt foof fool foos foot for- forb forl foro forr fors fort fosb foso foss fost foto fots fott foul four fous fout frob frol fros frot frou frsb frso frst frub fsfo fssf ft-l ftlb ftos ftrs ftsr ftub fubb fubs fubu fuff fufu full fuls fulu fuor fur- furl furo furr furs furt fuso fuss fust fusu futo futs futu lblr lbos lbrs lbrt lfts llbs llll lloo lob- lobb lobo lobs loff loft loll lolo lols loob loof lool loor loos loot loro lors loso loss lost lotl loto lotr lots lott loul lour lous lout louu lrrr lrst lrts ls-r lsbu lsof lsso lssr lsts ltbf ltbl ltrs ltsr lttr lubs luff luft lufu lull lulu lurs lurt luso luss lust luts obbo obls oblu obol obor obos obot obro obsr obss obst obts obus off- offo offr offs offu ofor ofst ofus olbo olfs ollo olof olor olos olot olst oltu olur ooff oofs oolo oooo ooos oort oost ootb oots oous orbb orbo orbs orbu orff orfs orfu orlo orlu oro- orof oror oros orot orro orrs orso orsu orto orts orub orus oslo osoo osor osos osro ossb osso ossu ostr osts osul otbs oto- otof otoo otor otos otro otrs otso otsu otto otts ottu otur otus oubs ouff ouls oulu our- ouro ours ourt oust out- outb outo outs ouu- rbbb rbbr rbbs rbsl rbss rbst rffl rlls rob- robb robo robs robt robu roff rofl rofo rolf roll rolo rolt roob roof rool roor roos root roro rort roru roso ross rost rotl roto rotr rots rott roub rouf roul rous rout rrrr rsos rssl rsts rstu rtbf rtfb rtls rtlt rtss rtts rubb rubs rubu ruff rufo ruft rull rulo ruro rurs ruru ruso russ rust rusu rutl ruto ruts rutt rutu s-os sbbs sbor sbot sbst sbus sfls sfor sfos sfro sfss sfsu sfts slft slob sloo slos slot slrs slst slsu slts slub slur slut sobo sobr sobs sobt sobu sofo soft solf soll solo solr sols solt soof sool soor soos soot sorb soro sorr sors sort soru soso soss sost sotl soto sots sotu souf soul sour sous sout sros srtr srub ssbr ssfl sslt ssot ssrl ssrs sssb sssf ssss sstb sstl ssts stbs stfu stlo stlt stob stof stol stoo stor stos stot stou stro strs stru stsf stss sttr stub stuf stul stur stus stut sub- subb subl subo subs suf- suff sufr sufs sufu sul- sulf sull sulo sult sulu suor suos sur- surf suro surr surs surt suru sus- suso suss sust susu suto sutu suus tbbs tbrb tbst tfot tfrs tfss tlos tlrs tobo tobs tobt tobu toff tofo toft tofu tol- toll tolo tolt tolu toof tool toor toos toot torf toro torr tors tort toru tosb toso toss tost tosu toto totr tots tott toul tour tous tout trfr troo tros trot trou trst trtr trub trus trut truu tsfl tsob tsol tsos tsou tssf tssr tsst tsts ttbb ttff ttss tttt ttul tubb tubo tubr tubs tubu tuff tufo tuft tufu tull tulo tulu tuor tuos turb turf turo turr turs turt turu tuss tust tutl tuto tuts tutt tutu tuuo ubbo ublo ubls ubos ubtf ufos ulft ullo ullr ulo- ulos ulto ults ultt ulul ulus uofl uofo uor- urbs urff urft urls uro- urol uroo urso urss ursu urts urur urus urut usbl usbr usbs usfl usfs uslu usos ussb ussf ussr usss usst ussu ustb usto usts usul usus utfo utor utsl utto uttu uulu uutf uuuu