b-tree bbbbbb beebee beebem beembe beemer beerme beeter bemeet bemete bemute berbee berber bereet berere bermet berrer berret bertem bertre berube beteem betere betete betrue bettee better betutu beumer beurre breere bremer brette breuer brubru bruree brutum bubber bububu bumbee bummer burbet burbur burree burrer burret burutu butere butter ebbert eburru eburum eebree embree embrue embute emeere emeter emeute emmert emmett emmure erbree eretum errett ettutu eutere m-tree mbembe meerut meeter meetme meetre member membre mememe memere merete mermer mermet merrem merret merter merure meteer metrer metrum metter mettet mettur meurte muerte muette mummer murmur murree murter mutere mutter muttur mutuum muumuu r-tree rebute remeet remete remeue reteer reteet retere reterm retree retret retter rettur retube returu reuere reuter reutte reutum rubbee rubber rubrum rubutu rumber rumbur rummer rurutu ruttee rutter rutube t-tree t-tube teebee teemer teerme teetee teeter tembre temere terete termer terrer terret terter tertre tetete tetter trebur treete tremet tretee trette truett trumbe tubber tumer tummer tumtum turbet turmer turmut turret turrum turtur tururu tuteur tutter tuttut tutume u-tube ureter urette uteute