-tree bbbee be-er beber beebe beete bembe bemer bemet berbe beret berme berre berte betee beter betre bett- bette bmxer bre-x breem breer breet breme bremm brere brett bretx brmmm brrrr btr-t ebber ebbet ebert eeeee embee ember emeer emere emert emmer emmet emtee erbbe erber erem- erere erte erter etete etext etree etter exeem exeme exert exmet exter extre mbebe mbere mbret mebbe meere meete membe memer memex merer meret merre merte meter metr- metre metrx mette mexer mmmmm mrmet mt-te mt-tm mt-tr mt-tt mtree rebbe reber rebet reeme reere remee remer remet remex rere- reree reret retee retem reter retex rette rexer rtext t-rex tbtbt teber tebet teeme tembe terem teret terex terme terre tert- teter tetex tetr- tette texte treer treet treme trere trete trett ttttt xbxrx xerem xerte xetex xexex xmmer xterm xtext xtree