bbbb bbbs bbrg bggs bgst bobb bobo bobs bogg bogo bogs bogt boob boog boor boos boot bor- borg boro borr bors bort boso boss bost botb boto bots bott brob brog broo bror bros brot brrr brrs brsb brsr brst bsgs bsos bsts btob btor btrt btss bttb gbbo gbbs ggbt gggg ggss gobo gobs gogo gogs goog goor goos goot gorb gorg goro gorr gors gort goso goss gost goto gots gott grbr grob grog groo gror gros grot grrr grrs grss gsos gstr gtbr gtos obbo obor obos obot obro obsr obss obst obts ogb ogog ogro oooo ooos oort oost ootb oots orbb orbo orbs orgo orgs oro- oror oros orot orro orrs orso orto orts osoo osor osos osro ossb osso ostr osts otbs oto- otog otoo otor otos otro otrs otsg otso otto otts rbbb rbbr rbbs rbss rbst rgtr rgts rob- robb robo robs robt rogg rogo roob roog roor roos root roro rort roso ross rost rotg roto rotr rots rott rrrr rsgb rsos rsts rtgs rtss rtts s-os sbbs sbor sbot sbst sggg sggs sgro sgss sgts sobo sobr sobs sobt sogo sogs soog soor soos soot sorb sorg soro sorr sors sort soso soss sost soto sots srgb sros srtr ssbr ssgs ssgt ssot ssrg ssrs sssb ssss sstb ssts stbs stgr stob stog stoo stor stos stot stro strs stss sttr tbbs tbgs tbrb tbst tgts tobo tobs tobt togo togr togs togt toor toos toot torg toro torr tors tort tosb toso toss tost toto totr tots tott trog troo tros trot trst trtr tsgt tsob tsos tssg tssr tsst tsts ttbb ttss tttt