k-os kkkk kkoo kkor kkot kkov kkpk kkps kkpt kkrk kkro kkrr kkrs kkrt kkrv kksp kksr kkss kkst kktk kkts kktv kkvr kkvt kkvv kokk koko kokp kokr koks kook kooo koop koor koos koot koov kopp kopr kops kopt kork koro korr kors kort korv kos- koso kosp kosr koss kost kotk koto kotr kots kott kotv kovk kovo kovr kpkk kpkr kpok kpoo kpop kppk kppo kppp kppr kppv kprk kpro kprp kprr kprs kprt kprv kpso kpsp kpto kptr kpts kptt kptv kpvr kpvs krkk krko krkr krks krkv krok kroo krop kror kros krov krpr krps krpt krrk krro krrr krrs krrt krsk krsr krss krst krsv krtk krto krtr krts krtv krvk krvo krvr krvs krvv kskk ksko kskr ksks ksok ksoo ksop ksor ksos kspk kspo kspr ksps kspt ksro ksrp ksrr ksrs ksrt ksrv ksso kssr ksss ksst kstk ksto kstp kstr ksts kstt kstv ksvp ksvr ktkk ktko ktkr ktks ktkt ktok ktoo ktop ktor ktot ktpk ktpo ktpr ktpt ktrk ktro ktrp ktrr ktrs ktrt ktrv ktso ktsr ktst kttk ktto kttp kttr ktts kttt kttv ktvk ktvo ktvr ktvt kvok kvoo kvop kvor kvot kvov kvps kvpt kvro kvrp kvrr kvrv kvso kvsp kvsr kvss kvst kvsv kvtk kvto kvtr kvtt kvtv kvvp kvvr kvvs kvvv okko okok okor okot okpo okro okso okto oooo ooos oops oort oost ootp oots opo- opor opos oppo opps opto opts orko oro- orok oror oros orot orps orro orrs orsk orso orto orts orvr orvs osoo osor osos osov osro osso ostr osts oto- otok otoo otor otos otov otpp otro otrs otso otto otts ovo- ovoo ovot ovpp pkts poko pook poop poor poos poot pop- popo popp pops popt pork poro porr pors port posk poso poss post poto pots pott povo povs ppos pppo pppp ppps ppss ppts pptt pptv pro- proo prop pros prot prov prps prrs prso prss prsv prtp prtr psos psov pspp pspr psps psrk psrp psso psst psts pstv psvt ptop pttk pvts rkos rkss rksv rkts rokk roko rokr roks rook roop roor roos root ropo rops rork roro rort roso rosp ross rost rotk roto rotr rots rott rovo rovs rpos rpps rpts rrrr rrsp rsos rspk rspo rsps rstp rsts rsvp rtps rtss rttp rtts rvsp s-os s-vt skop skor skot skov skpo skrt skss sokk soko sook soop soor soos soot sopo sopp sops soro sorr sors sort soso soss sost sosv sotk soto sotp sots sovo sovs spkr spok spoo spop spor spos spot spps spro sprs spso spsp spss spst spto sptr spts sros srps srpt srsp srtp srtr srtv ssop ssot sspo ssps sspt ssrs ssss sstp ssts ssvp st-v stks stok stoo stop stor stos stot stpp stps strk stro strs stss sttr stvs svor svtr tkos tkts toko took toor toos toot top- topo topp tops topt topv tork toro torp torr tors tort torv tosk toso toss tost toto totr tots tott tovo tpks tppp tppr tprs tptp tptr troo trop tros trot trpp trps trpv trst trtr trvs tsks tsop tsos tspo tsps tspt tssr tsst tsts ttop ttss tttt tvos tvro tvrr tvss tvtv vkor voks voor voot vopt vor- voro vors vort voso voss voto votp vovk vpro vrot vrto vsop vsrp vsto vtpr vtrs vvvv