-tree c-p-c c-tec ccccc ccett ceere cepet cerc- cerce cerec cerer ceret cerre certe cette cpctc crece creep creer crepe crept crete cteep ctree cttee eeeee eepee eperc erect erept erere erte erter etete etree etter p-rep pcept pcert pctct peece peere peert peete pepee peppe pept- perce perec perer peret perre perte peter petr- petre pette prece prete pter- ptere ptprc ptpre ptprr ptprt recce recep recet recpt rect- recte reece reepe reere repec repet reppe reprt rere- reree reret retee reter rette teepe tepee tepet terce teret terre tert- teter tetr- tette treer treet trepp trept trere trete trett ttttt