eeee eero eete eetu eore eoto erer eret eroe eroo erre erro ertu erur etee eter etoe etre etro ette etto ettu euer eur- eure euro eurt o-eo oere ooer oooo oore oort ore- oreo orer oro- oroe oror orot orro orte orto otee oter oto- otoe otoo otor otre otro otte otto ottu otur ouer our- oure ouro ourt out- oute outo ouu- reet reot reou rere rero rert reru rete reto retr rett reue reut reuu roer roet roor root rore roro rort roru rote roto rotr rott roue rout rrrr rtee ruer ruet rure ruro ruru rute ruto rutt rutu teer teet teor ter- tere tero terr teru tete teto tetr tett tetu teut toee toer toet toor toot tore toro torr tort toru tote toto totr tott tour tout tre- tree treo tret treu troe troo trot trou trte trtr true trut truu tteo tter ttoe tttt tuer tuet tuor ture turo turr turt turu tute tuto tutt tutu tuuo uor- uore ure- uret uro- uroo urre urte urur urut uter utor utto uttu uuuu