-tree eeeee emeer emere emert emese emmer emmet emtee erem- erere erest erets ermes erres erses erste ersts erte erter ertes esere esmes esser esses essse estee ester estes estet estre etest etete etree etres etter ettes m-set meees meems meere meers meese meest meete meets memer memes merer meres meret merms merre merse merss merte mesee mesem meses messe meste meter metes metr- metre metse mette metts mmmmm mrmet mt-te mt-tm mt-tr mt-tt mtree reeme reere reese reest remee remer remet remse rere- reree reres reret resee reses reset resse reste restr rests retee retem reter retes rette retts rtems seeem seeme seems seere seers seese seest seete semee semes semet semme serer seres seret serme serre serse serss sert- serte serts seser seses sesse seste setee setem seter setme setse sette setts smees smeet smere smert smets sssss steem steer stees steet stemm stems stere sterr sters stert stete stets stree strem stret strrs strsm teeme teems teers teese teest teets temes temse terem teres teret terme terms terre terrs terse tert- tesem tesse teste tests teter tetes tetr- tette treer trees treet treme trere tres- trese tress trest trete trets trett tsere tsets tsmmr ttest ttttt