-ous bbbb bbbs bblb bbls bffl bffs blls blob bloo blou blss blub bluf blus bobb bobo bobs bobu boff bofs bofu boll bolo bols bolu boob boof bool boos boso boss bosu bouf boul bous bsff bsfs bsos bubb bubo bubs bubu buff bufo bulb bull buls bulu buol buss busu buus fbus ffff ffss flob floo flos flou flub fluf fluo flus fobs fofo foll folo fols foof fool foos fosb foso foss foul fous fsfo fssf fubb fubs fubu fuff fufu full fuls fulu fuso fuss fusu lbos llbs llll lloo lob- lobb lobo lobs loff loll lolo lols loob loof lool loos loso loss loul lous louu lsbu lsof lsso lubs luff lufu lull lulu luso luss obbo obls oblu obol obos obss obus off- offo offs offu ofus olbo olfs ollo olof olos ooff oofs oolo oooo ooos oous oslo osoo osos ossb osso ossu osul oubs ouff ouls oulu ouu- s-os sbbs sbus sfls sfos sfss sfsu slob sloo slos slsu slub sobo sobs sobu sofo solf soll solo sols soof sool soos soso soss souf soul sous ssfl sssb sssf ssss sub- subb subl subo subs suf- suff sufs sufu sul- sulf sull sulo sulu suos sus- suso suss susu suus ubbo ublo ubls ubos ufos ullo ulo- ulos ulul ulus uofl uofo usbl usbs usfl usfs uslu usos ussb ussf usss ussu usul usus uulu uuuu