bbbb bbbs bblb bbls blbt blls blob bloo blot blss blst blts bobb bobo bobs boll bolo bols bolt boob bool boor boos boot bor- boro borr bors bort boso boss bost botb boto bots bott brls brob brol broo bror bros brot brrr brrs brsb brsr brst bsos bsts btob btor btrt btss bttb lblr lbos lbrs lbrt llbs llll lloo lob- lobb lobo lobs loll lolo lols loob lool loor loos loot loro lors loso loss lost lotl loto lotr lots lott lrrr lrst lrts ls-r lsso lssr lsts ltbl ltrs ltsr lttr obbo obls obol obor obos obot obro obsr obss obst obts olbo ollo olor olos olot olst oolo oooo ooos oort oost ootb oots orbb orbo orbs orlo oro- oror oros orot orro orrs orso orto orts oslo osoo osor osos osro ossb osso ostr osts otbs oto- otoo otor otos otro otrs otso otto otts rbbb rbbr rbbs rbsl rbss rbst rlls rob- robb robo robs robt roll rolo rolt roob rool roor roos root roro rort roso ross rost rotl roto rotr rots rott rrrr rsos rssl rsts rtls rtlt rtss rtts s-os sbbs sbor sbot sbst slob sloo slos slot slrs slst slts sobo sobr sobs sobt soll solo solr sols solt sool soor soos soot sorb soro sorr sors sort soso soss sost sotl soto sots sros srtr ssbr sslt ssot ssrl ssrs sssb ssss sstb sstl ssts stbs stlo stlt stob stol stoo stor stos stot stro strs stss sttr tbbs tbrb tbst tlos tlrs tobo tobs tobt tol- toll tolo tolt tool toor toos toot toro torr tors tort tosb toso toss tost toto totr tots tott troo tros trot trst trtr tsob tsol tsos tssr tsst tsts ttbb ttss tttt