k-os kkkk kkoo kkor kkot kkrk kkro kkrr kkrs kkrt kksr kkss kkst kktk kkts kokk koko kokr koks kook kooo koor koos koot kork koro korr kors kort kos- koso kosr koss kost kotk koto kotr kots kott krkk krko krkr krks krok kroo kror kros krrk krro krrr krrs krrt krsk krsr krss krst krtk krto krtr krts kskk ksko kskr ksks ksok ksoo ksor ksos ksro ksrr ksrs ksrt ksso kssr ksss ksst kstk ksto kstr ksts kstt ktkk ktko ktkr ktks ktkt ktok ktoo ktor ktot ktrk ktro ktrr ktrs ktrt ktso ktsr ktst kttk ktto kttr ktts kttt okko okok okor okot okro okso okto oooo ooos oort oost oots orko oro- orok oror oros orot orro orrs orsk orso orto orts osoo osor osos osro osso ostr osts oto- otok otoo otor otos otro otrs otso otto otts rkos rkss rkts rokk roko rokr roks rook roor roos root rork roro rort roso ross rost rotk roto rotr rots rott rrrr rsos rsts rtss rtts s-os skor skot skrt skss sokk soko sook soor soos soot soro sorr sors sort soso soss sost sotk soto sots sros srtr ssot ssrs ssss ssts stks stok stoo stor stos stot strk stro strs stss sttr tkos tkts toko took toor toos toot tork toro torr tors tort tosk toso toss tost toto totr tots tott troo tros trot trst trtr tsks tsos tssr tsst tsts ttss tttt