-tree eeeee eepee eerie eetti eipri eirie eiter eitri eppie erept erere erier erite erixx erte erter etete etext etite etree etter ettie exept exert exite exper exptr exter extre ieiri iepe ieper ierei iette iiiee iiiii iitti ipeti ipiti ippee ippei iprex irete irite irpex irrep irrit itete itext itire itrip itter ittre ittti p-rep peere peeri peert peete peire peirt peixe pepee peppe peppi pept- perer peret peri- perie perit perre perri perte perti peter petie petit petr- petre petri pette petti pexip piere pieri piert piiri piper pipet pipex pipit pippi pipri pirex pirie pirix pirre pirri piter pitie pitip pitre pitri pitti pixie ppxii preie prete preti prier priit prite priti pritt pter- ptere pteri ptpre ptprr ptprt reepe reere reeti repet repit reppe reprt rere- reree reret rerip rerir retee reter retex retie retip rette rexer rieti riper ripit rippe ririe rripe rtext t-rex teepe tepee tepet tepit teret terex terre terri tert- teter tetex tetr- tetri tette texte ti-ti tieit tiere tieri tierp tiexi tiper tipet tipit tippi tiree tirer tiret tirit titer titii titre titte titti tixte treer treet treie treip treit treix trepp trept trere treri trete trett triei trier triet triip tripe tripi tripp tript trit- trite tritt ttttt xerte xetex xexex xtext xtree xxiii xxxii xxxix