eeee eete eetu epee eper eppp eprp epte erer eret erpe erre ertu erur etee eter etre ette ettu euer eur- eure eurt peep peer peet pepe per- pere perp perr pert peru pete petr pett peur peut pper pppp ppru pptt ppur pre- pree prep pret preu prtp prtr prue prut pruu pter pu-e puer puet pueu pupe pupu pur- pure purp purr puru put- pute putt putu reep reet repe repp repr rept repu rere rert reru rete retr rett reue reup reut reuu rpet rrrr rtee rttp ruer ruet rupe rupp rupt rure rurp ruru rute rutt rutu teer teet tepe tepp tepu ter- tere terp terr teru tete tetr tett tetu teut tper tppp tppr tpte tptp tptr tput tre- tree tret treu trpe trpp trte trtr true trut truu tter tttt tuer tuet tupe tupu ture turp turr turt turu tute tutt tutu u-rp uppe uppp uppu upup ure- uret urre urte urup urur urut utep uter uttu uuuu