-tree bbbee bcell be-er bebel beber becel beebe beele beete belce belec belee belet bellb belle berbe berec berel beret berle berre berte betee betel beter betle betre bett- bette bleer bleet blere blete brece breel breer breet brell brere brett brrrr btc-e btr-t c-tec ccccc ccell ccett ccrcl ccrel cctrl cebec ceber ceele ceere celeb celer cell- celle celte cerc- cerce cerec cerer ceret cerre certe cette cleer cleet clerc clere clete clett crebe crece creel creer crele crell crete crrel ctree ctrlc cttee ebber ebbet ebble ebell eberl ebert eccle eeeee eeler elect eleet elele ellel eller ellet elrec erbbe erber erect erere erte ertel erter etete etree ettel etter ettle lebce lebec lebel leber lebet lecce leece leell leere leert lelle lerer letbe letre lette rebbe rebec rebel reber rebet recce recet rect- recte reece reere relee relet relte rere- reree reret retee retel reter rette tbtbt tcell teber tebet tectb teele teell telce tele- telec teler tell- telle terce teret terre tert- tetel teter tetle tetr- tette tlell tlett tllbr treer treet trele trere trete trett ttttt