-tree eeeee efere efetf effer effet efrem efter emeer emere emert emmer emmet emtee erem- erere erte erter etete etree etter feeme feere femme feret ferme ferr- ferre ferte feter fette freer freet freme fremm frere frett ftrtt meefe meere meete memer merer meret merre merte meter metr- metre mette mmmmm mrmet mt-te mt-tf mt-tm mt-tr mt-tt mtfmt mtree reefe reeft reeme reere refer refet reffe refme remee remer remet rere- reree reret retee retem reter rette rtrfm teeme tefe terem teret terme terre tert- teter tetr- tette treer treet trefe treff treme trere trete trett ttttt