-tree bbbee be-er beber beebe beete bembe bemer bemet berbe berec beret berme berre berte betee beter betre bett- bette brece breem breer breet breme bremm brere brett brmmm brrrr btc-e btr-t c-met c-tec ccccc ccett cebec ceber ceere cemec cemre cerc- cerce cerec cerer ceret cerre certe cetme cette cmere crebe crece creem creer creme crete ctree cttee ebber ebbet ebert eeeee eembc eemct embee ember emcee emeer emere emert emmer emmet emtec emtee erbbe erber erect erem- erere erte erter etete etree etter mbcet mbebe mbere mbret mcbee mcree mebbe meece meere meete membe memer merce merer meret merre merte meter metr- metre mette mmccc mmmcc mmmmm mrmet mt-tc mt-te mt-tm mt-tr mt-tt mtree rebbe rebec reber rebet recce recet rect- recte reece reeme reere remee remer remet rere- reree reret retee retem reter rette tbtbt teber tebet tectb teeme tembe terce terem teret terme terre tert- teter tetr- tette treer treet treme trere trete trett ttttt