-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 etext etree etter excpt exect execx exept exert exper exptr exter extre p-rep pcept pcert pctct peece peere peert peete pepee peppe pept- perce perec perer peret perre perte peter petr- petre pette pexec 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 retex rette rexer rtext t-rex teepe tepee tepet terce teret terex terre tert- teter tetex tetr- tette texte treer treet trepp trept trere trete trett ttttt xerte xetec xetex xexex xpect xtext xtree