-ous bbbb bbbs bblb bbls blls blob bloo blou blss blub blur blus bobb bobo bobs bobu boll bolo bols bolu boob bool boor boos bor- boro borr bors boru boso boss bosu boul bour bous brls brob brol broo bror bros brou brrr brrs brsb brsr brus bsos bubb bubo bubs bubu bulb bull buls bulu buol bur- burb burl buro burr burs buru buss busu buus lblr lbos lbrs llbs llll lloo lob- lobb lobo lobs loll lolo lols loob lool loor loos loro lors loso loss loul lour lous louu lrrr ls-r lsbu lsso lssr lubs lull lulu lurs luso luss obbo obls oblu obol obor obos obro obsr obss obus olbo ollo olor olos olur oolo oooo ooos oous orbb orbo orbs orbu orlo orlu oro- oror oros orro orrs orso orsu orub orus oslo osoo osor osos osro ossb osso ossu osul oubs ouls oulu our- ouro ours ouu- rbbb rbbr rbbs rbsl rbss rlls rob- robb robo robs robu roll rolo roob rool roor roos roro roru roso ross roub roul rous rrrr rsos rssl rubb rubs rubu rull rulo ruro rurs ruru ruso russ rusu s-os sbbs sbor sbus slob sloo slos slrs slsu slub slur sobo sobr sobs sobu soll solo solr sols sool soor soos sorb soro sorr sors soru soso soss soul sour sous sros srub ssbr ssrl ssrs sssb ssss sub- subb subl subo subs sul- sull sulo sulu suor suos sur- suro surr surs suru sus- suso suss susu suus ubbo ublo ubls ubos ullo ullr ulo- ulos ulul ulus uor- urbs urls uro- urol uroo urso urss ursu urur urus usbl usbr usbs uslu usos ussb ussr usss ussu usul usus uulu uuuu