bbbb bbbs bggs bgst bobb bobo bobs bogg bogo bogs bogt boob boog boos boot boso boss bost botb boto bots bott bsgs bsos bsts btob btss bttb gbbo gbbs ggbt gggg ggss gobo gobs gogo gogs goog goos goot goso goss gost goto gots gott gsos gtos obbo obos obot obss obst obts ogb ogog oooo ooos oost ootb oots osoo osos ossb osso osts otbs oto- otog otoo otos otsg otso otto otts s-os sbbs sbot sbst sggg sggs sgss sgts sobo sobs sobt sogo sogs soog soos soot soso soss sost soto sots ssgs ssgt ssot sssb ssss sstb ssts stbs stob stog stoo stos stot stss tbbs tbgs tbst tgts tobo tobs tobt togo togs togt toos toot tosb toso toss tost toto tots tott tsgt tsob tsos tssg tsst tsts ttbb ttss tttt