b-tree bbbbbb becure beebee beeper beeter berbee berber bereet berere berrer berret bertre berube betere betete betrue bettee better betutu beurre breere bretcu brette breuer brubru bruree bubber bububu burbet burbur burcer burpee burper burree burrer burret burrup burutu butere butter butucu c-cube ceecee cepure cerete ceruce creete crupet ctcpec cubber cubert cubube cucube cucurb cupper curber curepe curete currer curret curter cut-up cutcut cuttee cutter cutupu ebbert eburru eebree eerect erbree errett etcetc ettutu eutere p-cube pberet pebete peepee peeper peerce peerer peeter peetre pepper percee percer percur perere peretu perper perpet perree perret perter pertre pet-ct peteet peteru petree petrer petter pettet pppppp precut preece preeue prepub preter pretre prette preue- pruett pubber puerer puppet pupput purete purpre purpur purree purrer put-up putput putrer puttee putter puttur puture r-tree rebbec rebeuc rebute recept recrue recuer recurb recure recurt reeper repete repper repure repuru repute retece reteer reteet retere retree retret retter rettur retube returu reuere reuter reutte rub-up rubbee rubber rubutu rupert rurutu ruttee rutter rutube t-tree t-tube teebee teepee teerpu teetee teeter tepece tepper tercer tercet terete terper terrer terret terter tertre tetete tetter teucer tr-rec trebce trebur treece treete treppe tretee trette treuce truett trueup tubber tuppee tupper turbet turret turtur turucu tururu tuteur tutter tuttut u-tube uctepe up-cut up-put ureter urette urucup uruppu uteute