koso kosp kosr koss kost kotc kote kotk koto kotr kots kott kpcc kpcr kpcs kpek kper kpet kpke kpkk kpkr kpoc kpoe kpok kpoo kpop kppc kppk kppo kppp kppr kprc kpre kprk kpro kprp kprr kprs kprt kpsc kpso kpsp kpte kpto kptr kpts kptt krcc krce krco krcs krec kree krek kreo kres kret krkc krke krkk krko krkr krks kroc kroe krok kroo krop kror kros krpr krps krpt krrc krre krrk krro krrr krrs krrt krsc krse krsk krsr krss krst krtc krtk krto krtr krts ksce ksck ksco kscr kscs ksec ksee ksek kseo ksep kser kset kske kskk ksko kskr ksks ksoc ksok ksoo ksop ksor ksos kspc kspe kspk kspo kspr ksps kspt ksro ksrp ksrr ksrs ksrt ksse ksso kssr ksss ksst kstc kste kstk ksto kstp kstr ksts kstt ktcc ktce ktck ktco ktcr ktcs ktec ktee ktek ktep ktkc ktke ktkk ktko ktkr ktks ktkt ktoc ktoe ktok ktoo ktop ktor ktot ktpk ktpo ktpr ktpt ktrc ktre ktrk ktro ktrp ktrr ktrs ktrt ktsc ktso ktsr ktst kttc kttk ktto kttp kttr ktts kttt o-eo occc occt oce ocee ocet ocke ocks ocos ocpp ocre ocro ocrr ocrs oct- octe octo octs oec- oecc oeec oeps oere oers oese oest oker okes oket okko okok okor okot okpe okpo okre okro okso okto oocr ooer ooes oooo ooos oops oore oort oose oost ootp oots opec opep oper opes opet opo- opor opos oppo opps opto opts orce orco orcs ore- orec orek oreo orer ores orke orko oro- oroe orok oror oros orot orpc orpe orps orro orrs orse orsk orso ortc orte orto orts oscc osce osco osec osee osek oser oses oset osoo osor osos osro osse osso ostc oste ostr osts otee otep oter otes oto- otoe otok otoo otor otos otpp otre otro otrs otse otso otte otto otts pccc pcce pccs pcep pcer pcks pcoe pcos pcpp pcps pcrc pcre pcse pcso pcte pcts pece peck peco pecr pecs pect peec peek peep peer pees peet peke pekk peko peor pepe pepo peps per- perc pere perk pero perp perr pers pert pese peso pess pest pete peto petr pets pett pkcs pkts poce pock poco pocs poer poes poet poke poko pook poop poor poos poot pop- popc pope popo popp pops popt porc pore pork poro porr pors port pose posk poso poss post potc pote poto pots pott ppcc ppcs pper ppos pppo pppp ppps pprc ppss ppts pptt prcc prcp prcs pre- prec pree prek prep pres pret pro- proc proe proo prop pros prot prps prrs prsc prse prso prss prtc prtp prtr psco psec psoc psos pspp pspr psps psrk psrp pssc psse psso psst psts ptcc pter ptop pttc pttk rccc rccs rcep rcet rcos rcpo rcps rcpt rcsc rcss rctc rcts recc rece reck recp recr recs rect reek reep rees reet reke reko reks rekt reop reos reot repe repo repp repr reps rept rere rero rers rert rese reso resp ress rest rete reto retr rets rett rkos rkss rkts rocc roce rock roco rocs roer roes roet roke rokk roko rokr roks rook roop roor roos root rope ropo rops rorc rore rork roro rort rosc rose roso rosp ross rost rotc rote rotk roto rotr rots rott rpcs rpet rpoe rpos rpps rpts rrrr rrsp rscc rscs rsee rsos rspk rspo rsps rsre rstp rsts rtcc rtce rtee rtes rtps rtss rttp rtts s-os sccc scce sccp sccs scct scec scee scep scer scet sck- scok scoo scop scor scot scpe scpo scps scpt scr- scrc scre scrs scsc scso scsr scst sctc scto sctr scts se-c se-e se-k se-o se-s se-t sec- secc sece seck seco secr secs sect seec seek seep seer sees seet seke sekk seko sekt seoc seok seop sepe sepo sepp sepr seps sept serc sere serk sero serp serr sers sert sesc sese seso sess sest set- setc sete seto sets sett skee skeo skep sker skes sket skoe skop skor skot skpc skpo skrt skss soce sock soco socr socs soec soeo soep soes soke sokk soko sook soop soor soos soot sope sopo sopp sops sore soro sorr sors sort sose soso soss sost sotc sote sotk soto sotp sots spcc spco spcs spec spee spek sper spes spet spke spkr spoc spok spoo spop spor spos spot spps spro sprs spse spso spsp spss spst sptc spto sptr spts srcc srct srec sreo sres sros srpc srps srpt srsp srtp srtr sscc ssce sscp sscs ssec ssee ssep sses sset ssoc ssop ssot sspc sspe sspo ssps sspt ssrc ssrs sssc ssss sstc sstp ssts stcc stcp stcs stec stee stek steo step ster stes stet stks stoe stok stoo stop stor stos stot stpp stps strc stre strk stro strs stss sttc sttr tccc tcep tcos tcpo tctc tcts teck teco tecr tecs tect teec teek teer tees teet teke teok teor teos tepe tepp ter- terc tere terk tero terp terr ters tesc tese teso tesp tess test tete teto tetr tets tett tkos tkts toce tock toco toee toek toer toes toet toke toko took toor toos toot top- tope topo topp tops topt torc tore tork toro torp torr tors tort tosc tose tosk toso toss tost totc tote toto totr tots tott tpck tpcp tpcs tper tpke tpks tppp tppr tprs tpsc tpte tptp tptr trcc tre- trec tree trek treo tres tret troc troe troo trop tros trot trpc trpe trpp trps trst trtc trte trtr tscc tscp tsec tses tset tsks tsop tsos tspo tsps tspt tsse tssr tsst tstc tsts ttcp tteo tter ttoe ttop ttss tttt

-tree c-cor c-p-c c-pop c-tec ccccc ccett ceco- cecos ceere ceese ceoce ceoor ceose cepes cepet cepos cepot ceppo cerc- cerce cerco cercs cerec cerer ceres ceret cerke cero- ceroc ceros cerps cerre cerro cerrs cerse cerss certe certs cesce cescr cesko cesse ceste cests cetes