-tree c-p-c c-tec ccccc ccett ccnet ceene ceere cence cenpn cenpt cent- centr cepet cerc- cerce cerec ceren cerer ceret cerne cerre certe ceten cette cnnnn cntrc cpctc crece creen creep creer cren- crepe crept crete crnce crnec crner cteep cten- ctene ctree cttee e-ten eccen eeeee eence eener eenet eepee eeten encre enent enete ennet enper enten enter entre epeen epene eperc erect ereen erept erere ernen ernet erte erter etern etete etnre etree etten etter n-p-n ncree necr- nect- neece neere nente neper neppe nepte neree neret nerre nerte neten netne netpc nette ntete p-n-p p-rep pcept pcert pctct peece peene peent peere peert peete pence pene- pener penne penre pent- pente pepee peppe pept- perce perec peren perer peret perne pernt perre perte peter petr- petre pette pnetc pptnt prece preen prene prent prepn prete prntr pter- ptere ptprc ptpre ptprn ptprr ptprt recce recen recep recet recpt rect- recte reece reene reepe reere rence renee rener renet renne rente repec repen repet reppe reprt rere- reree reret retee reter retnr rette rnpep rtenn tecn- teepe tencc tence tenen tener tenet tenne tenpn tente tepee tepet terce teret terne terre tert- teten teter tetr- tette tntnt treen treer treet trenc trene trent trepp trept trere trete trett ttnet ttttt