-ous bbbb bbbs bggs bgst bobb bobo bobs bobu bogg bogo bogs bogt boob boog boos boot boso boss bost bosu botb boto bots bott bous bout bsgs bsos bsts btob btss bttb btus bubb bubo bubs bubu bugg bugo bugs buss bust busu but- buto buts butt buus gbbo gbbs ggbt gggg ggss gobo gobs gogo gogs goog goos goot goso goss gost gosu goto gots gott gou- goug gous gout gsos gtos gubb gubs gubu gugb gugg gugu guos gusb guss gust guto guts gutt gutu guus obbo obos obot obss obst obts obus ogb ogog ogou ogus oooo ooos oost ootb oots oous osoo osos ossb osso ossu osts otbs oto- otog otoo otos otsg otso otsu otto otts ottu otus oubs oust out- outb outo outs ouu- s-os sbbs sbot sbst sbus sggg sggs sgss sgts sobo sobs sobt sobu sogo sogs soog soos soot soso soss sost soto sots sotu sous sout ssgs ssgt ssot sssb ssss sstb ssts stbs stob stog stoo stos stot stou stss stub stug stus stut sub- subb subg subo subs sug- sugg sugo suos sus- suso suss sust susu suto sutu suus tbbs tbgs tbst tgts tobo tobs tobt tobu togo togs togt toos toot tosb toso toss tost tosu toto tots tott toug tous tout tsgt tsob tsos tsou tssg tsst tsts ttbb ttss tttt tubb tubo tubs tubu tugg tugs tugu tuos tuss tust tuto tuts tutt tutu tuuo ubbo ubos uggo uggs uggt ugos uguu usbs usgo usog usos ussb usss usst ussu ustb usto usts usus utto uttu utug uuuu