bbbb bbbs bmts bobb bobo bobs bomb boms bomt boob boom boor boos boot bor- borm boro borr bors bort bosm boso boss bost botb boto bots bott brob brom broo bror bros brot brrm brrr brrs brsb brsr brst bsms bsmt bsos bsrm bssm bsts btob btor btrt btss bttb mbbs mbms mbrs mmmm mmms mmor mmst mmts mobb mobo mobs momo moms moob moor moos moot morb moro mors mort moso moss most motb motm moto mots mott mrbb mrbm mrbs mrtm mrts mrtt msmb msmm msms msor msrb msrt mssm mssr msst mstr msts mtbo mtbs mtom mtor mtrr mtss mtst mttr mtts obbo obor obos obot obro obsr obss obst obts ombo omo- omoo omor omro ooms oooo ooos oort oost ootb oots orbb orbo orbs ormo oro- orom oror oros orot orro orrs orso orto orts osm- osmo osoo osor osos osro ossb osso ostr osts otbs oto- otoo otor otos otro otrs otso otto otts rbbb rbbr rbbs rbms rbss rbst rmbs rmst rob- robb robo robs robt romb romm romo roms roob room roor roos root roro rort roso ross rost roto rotr rots rott rrrr rsos rsts rtms rtss rtts s-os sbbs sbor sbot sbst smos smot smrt smss sobo sobr sobs sobt somb somm somo soom soor soos soot sorb sorm soro sorr sors sort soso soss sost sotm soto sots sros srtr ssbr ssot ssrm ssrs sssb sssm ssss sstb ssts stbs stms stmt stob stom stoo stor stos stot stro strs stsm stss sttr t-mo tbbs tbrb tbst tmbr tmos tmro tmtt tobo tobs tobt tomb tomm tomo toms tomt toom toor toos toot torm toro torr tors tort tosb toso toss tost totm toto totr tots tott trmb trms trom troo tros trot trst trtr tsob tsom tsos tssm tssr tsst tstm tsts ttbb ttms ttss tttt