nnnn nnos nnot nnss nntn non- nonn nono nons nont noo- noon nooo noor noos noot nor- norn noro norr nors nort nos- noss nost not- noto nots nott nron nrts nsnr nsos nsso nssr nsss nsts ntss ntto nttr onno onon onor onos onso onst ont- onto oons oont oooo ooos oort oost oots orno orns oro- oron oror oros orot orro orrs orso orto orts osno osnr osoo osor osos osro osso ostr osts oto- oton otoo otor otos otro otrs otso otto otts rnnt rnot rono rons ront roon roor roos root roro rort roso ross rost rotn roto rotr rots rott rrrr rsnn rsno rsnr rsos rsts rtns rtss rtts s-os snns snoo snor snos snot snrs sntr son- sono sons sont soon soor soos soot sorn soro sorr sors sort soso soss sost sotn soto sots srnn srno sros srtr ssns ssot ssrs ssss ssts stnn stnr stns ston stoo stor stos stot strn stro strs stss sttr tnts tonn tono tons toon toor toos toot torn toro torr tors tort toso toss tost toto totr tots tott trno tron troo tros trot trst trtr tsos tssr tsst tsts tton ttss tttt