-tree c-p-c c-tec ccccc ccett ceere cepet cerc- cerce cerec cerer ceret cerre certe cette cpcfc cpctc crece creep creer creft crepe crept crete cteep ctree cttee ectfe eeeee eepee efere efetf effer effet efter eperc eptfe erect erept erere erte erter etete etree etter feere ferce feret ferr- ferre ferte feter fette frcpc freep freer freet frere frett ftrtt p-rep pcept pcert pctct peece peere peert peete pepee peppe pept- perce perec perer peret perre perte peter petr- petre pette prece preef preff prete pter- ptere ptprc ptpre ptprf ptprr ptprt recce recep recet recpt rect- recte reece reefe reeft reepe reere refer refet reffe repec repet reppe reprt rere- reree reret retee reter rette rperf teepe tefe tepee tepet terce teret terre tert- teter tetr- tette treer treet trefe treff trepp trept trere trete trett ttttt