eeee eefe eete eetu efet eft- eftu erer eret erft erre ertu erur etee eter etfe etre ette ettu euer eur- eure eurt feer feet fefe feff fere ferr fert feru fete fetr fett fetu ffee ffff ffrr fftf free fret frue fter fuet fuff fufu fur- fure furr furt fute futu reef reet refe reff refr reft refu rere rert reru rete retr rett reue reuf reut reuu rfef rrrr rtee ruer ruet rufe ruff ruft rure ruru rute rutt rutu teef teer teet teff teft ter- tere terf terr teru tete tetr tett tetu teut tre- tree tref tret treu trfr trte trtr true trut truu tter ttff tttt tuer tuet tufe tuff tuft tufu ture turf turr turt turu tute tutt tutu ufer uffe ure- uret urfe urff urft urre urte urur urut uter uttu uutf uuuu