ceecee cerete ceruce creeke creete creket crevet curete currer curret curter curver curvet cutcut cuttee cutter cvetke eckert eerect erketu errett etcetc ettutu eutere everte k-tree keeker keever kekkut kereru kerker kerkuk kertee kerver ketter ketuke keuruu kreker kretek krueck kukere kurkcu kurree kururu kutke kutter r-tree receve recrue recuer recure recurt reeker reever rekrut retece reteer reteet retere retree retret retter rettur returu reuere reuter reutte reuver revere revert revver rucker rukutu rurkee rurutu ruttee rutter t-tree teetee teeter teeuck teevee tekrur tercer tercet terete terrer terret terter tertre tetete tetter teucer tevere tr-rec treck- treece treete treker tretee trette tretuk treuce trevet truett truker tucker tucket tuktuk tureck turker turret turtuk turtur turucu tururu turver tuteur tutter tuttut tuvvur uecker ureter urette uteute utukku utukur uuvere veeker veerer verree verrer verret verrue vertre vertue verver vervet vetere vetter vvvvvv