bbbb bbbs bnor bnrr bnss bobb bobo bobs bonn bono bons bont boob boon boor boos boot booz bor- born boro borr bors bort borz bosn boso boss bost botb botn boto bots bott bozo brno brns brob bron broo bror bros brot broz brrr brrs brsb brsr brst bsns bson bsos bsts btob btor btrt btss bttb bzzt bzzz nbbo nnnn nnos nnot nnss nntn nobo nobs non- nonn nono nons nont noo- noob noon nooo noor noos noot nor- norb norn noro norr nors nort nos- noss nost not- noto nots nott nron nrts nsbo nsnr nsos nssb nsso nssr nsss nsts ntoz ntsb ntss ntto nttr nzrb nzst obbo obon obor obos obot obro obsn obsr obss obst obts onno onon onor onos onoz onso onst ont- onto onzo oons oont oooo ooos oort oost ootb oots orbb orbo orbs orno orns oro- oron oror oros orot oroz orro orrs orso orto orts orzo osno osnr osoo osor osos osro ossb osso ostr osts otbs oto- oton otoo otor otos otro otrs otso otto otts ozon rbbb rbbr rbbs rbss rbst rnbr rnnt rnot rob- robb robo robs robt rono rons ront roob roon roor roos root rooz roro rort roso ross rost rotn roto rotr rots rott rozz rrrr rsnn rsno rsnr rsos rsts rtns rtss rtts s-os sbbs sbor sbot sbst sbtn snns snob snoo snor snos snot snrs sntr sobo sobr sobs sobt son- sono sons sont soon soor soos soot sorb sorn soro sorr sors sort soso soss sost sotn soto sots soz- srnn srno sros srtr ssbn ssbr ssns ssot ssrs sssb ssss sstb ssts stbs stnn stnr stns stob ston stoo stor stos stot strn stro strs stss sttr szob szot szss tbbs tbrb tbst tnts tobo tobs tobt tonb tonn tono tons toon toor toos toot torn toro torr tors tort tosb toso toss tost toto totr tots tott tozo trno tron troo tros trot trst trtr tsob tsos tssr tsst tsts ttbb tton ttss tttt tzzt z-ro zobo zon- zons zoo- zoon zoos zoot zorb zorn zoro zors zort zoso zoss zots zott zotz zozo zsss ztst zzzs zzzz