-tree c-p-c c-tec ccccc ccell ccett ccrcl ccrel cctrl ceele ceere celer cell- celle celte cepet cerc- cerce cerec cerer ceret cerre certe cette cleer cleet clepe clept clerc clere clete clett cpctc crece creel creep creer crele crell crepe crept crete crrel cteep ctree ctrlc cttee eccle eeeee eeler eepee elect eleet elele ellel eller ellet elpee elper elrec eperc erect erept erere erpel erte ertel erter etete etree ettel etter ettle lecce leece leell leere leert lelep lelle lepel leper lepet leppe lepre lept- lerer letre lette p-rep pcell pcept pcert pctct pecel peece peele peell peere peerl peert peete pelee peler pelet pelle pepee pepel peple peppe pept- perce perec perel perer peret perle perre perte peter petr- petre pette pleep pleet plete prece prell prelp prepl prete pter- ptere ptprc ptpre ptprr ptprt recce recep recet recpt rect- recte reece reepe reere relee relet relte repec repel repet reple reppe reprt rere- reree reret retee retel reter rette tcell teele teell teepe telce tele- telec telep teler tell- telle tepee tepet terce teret terre tert- tetel teter tetle tetr- tette tlell tlett tpler treer treet trele trepp trept trere trete trett ttttt