otto otts ottu otur otus oucc ouer oupe our- oure ouro ours ourt ouse oust out- oute outo outs ouu- pccc pcce pccs pcep pcer pcoe pcos pcpp pcps pcrc pcre pcse pcso pcte pcts pece peco pecr pecs pect peec peep peer pees peet peor peou pepe pepo peps per- perc pere pero perp perr pers pert peru pese peso pess pest pesu pete peto petr pets pett peur peut poce poco pocs poer poes poet poop poor poos poot pop- popc pope popo popp pops popt porc pore poro porr pors port pose poso poss post potc pote poto pots pott potu poup pour pous pout ppcc ppcs pper ppos pppo pppp ppps pprc ppru ppss ppts pptt ppur prcc prcp prcs pre- prec pree prep pres pret preu pro- proc proe proo prop pros prot prou prps prrs prsc prse prso prss prtc prtp prtr prue prus prut pruu psco pscu psec psoc psos psou pspp pspr psps psrp pssc psse psso psst psts pstu ptcc pter ptop pttc pu-e puce pueo puer puet pueu pupe pups pupu pur- pure puro purp purr purs puru puss pust put- pute puto puts putt putu puuc rccc rccs rcep rcet rcos rcpo rcps rcpt rcsc rcss rctc rcts recc rece recp recr recs rect recu reep rees reet reop reos reot reou repe repo repp repr reps rept repu rere rero rers rert reru rese reso resp ress rest rete reto retr rets rett reue reup reus reut reuu rocc roce roco rocs roer roes roet roop roor roos root rope ropo rops rorc rore roro rort roru rosc rose roso rosp ross rost rotc rote roto rotr rots rott roue roup rous rout rpcs rpet rpoe rpos rpps rpts rrrr rrsp rscc rscs rsee rsos rspo rsps rsre rstp rsts rstu rtcc rtce rtee rtes rtps rtss rttp rtts ruce ruct ruer rues ruet rupe rupp rupt rurc rure ruro rurp rurs ruru ruse ruso russ rust rusu rute ruto ruts rutt rutu s-os sccc scce sccp sccs scct scec scee scep scer scet scoo scop scor scot scpe scpo scps scpt scr- scrc scre scrs scsc scso scsr scst scsu sctc scto sctr scts scup scur scut se-c se-e se-o se-s se-t se-u sec- secc sece seco secr secs sect secu seec seep seer sees seet seeu seoc seop sepe sepo sepp sepr seps sept sepu serc sere sero serp serr sers sert seru sesc sese seso sess sest set- setc sete seto sets sett seur soce soco socr socs soec soeo soep soes soop soor soos soot sope sopo sopp sops sopu sore soro sorr sors sort soru sose soso soss sost sotc sote soto sotp sots sotu soue soup sour sous sout spcc spco spcs spec spee sper spes spet spoc spoo spop spor spos spot spps spro sprs spse spso spsp spss spst sptc spto sptr spts spue spur spus sput 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 stcu stec stee steo step ster stes stet stoe stoo stop stor stos stot stou stpp stps strc stre stro strs stru stss sttc sttr stuc stue stup stur stus stut suc- succ sucr sucs suee suer sues suet sueu suor suos sup- supe supo supp supr sups supt sur- surc sure suro surp surr surs surt suru sus- suse suso susp suss sust susu sute suto sutu suus tccc tccu tcep tcos tcpo tctc tcts teco tecr tecs tect teec teer tees teet teor teos tepe tepp tepu ter- terc tere tero terp terr ters teru tesc tese teso tesp tess test tete teto tetr tets tett tetu teut toce toco toee toer toes toet toor toos toot top- tope topo topp tops topt topu torc tore toro torp torr tors tort toru tosc tose toso toss tost tosu totc tote toto totr tots tott toup tour tous tout tpcp tpcs tper tppp tppr tprs tpsc tpte tptp tptr tput trcc tre- trec tree treo tres tret treu troc troe troo trop tros trot trou trpc trpe trpp trps trst trtc trte trtr truc true trus trut truu tscc tscp tsec tses tset tsop tsos tsou tspo tsps tspt tsse tssr tsst tstc tsts tsup ttcp tteo tter ttoe ttop ttss tttt tucc tuco tuer tues tuet tuor tuos tupe tupo tups tupu turc ture turo turp turr turs turt turu tusc tuss tust tute tuto tuts tutt tutu tuuo u-rp uccp uces ucos ucrc ucsc ucst ucsu ucut uers uess uocc uor- uore upcs upor upos uppc uppe uppp uppu upsc upse upto upup ure- ures uret uro- uroo urpo urre urse urso urss ursu urte urts urup urur urus urut uscc usce usco uscs usee user uses uset usoc usoe usos uspc uspo uspp usps ussc usse ussr usss usst ussu ustc uste usto ustp usts usus utec utep uter utes utor utsc utto uttu uucp uuoc uuuu

-tree c-cor c-p-c c-pop c-tec ccccc ccett ccups ceco- cecos ceere ceese ceoce ceoor ceose ceous cepes cepet cepos cepot ceppo cerc- cerce cerco cercs cerec cerer ceres ceret cero- ceroc ceros cerou cerps cerre cerro cerrs cerse cerss certe certs cerus cesce cescr cesse ceste cests cetes ceto- cette cetus co-co co-op cocc- cocce cocco coceo cocos cocto cocur cocus coepe coers coest coete coeur coeus cooee cooer coope coops coopt coore coors coost coote coots copce copec coper copes copos coppe coppo copps copr- copre copro copse copte copto copts copur copus coput corce core- coree corer cores coreu coro- corop corot corpe corps corre corrs corse corso corss corsu corte corto corts corus cosco cosec coser coses coset cosse cost- coste costo costs coter cotes cotos cotso cott- cotte cotto cotts cottu couco couer coupe coups coure cours court couru couse coust couto couts coutu cpctc cpesc crece creep creer