crena rcena cerna ecrna recna ercna crnea rcnea cnrea ncrea rncea nrcea cenra ecnra cnera ncera encra necra renca ernca rneca nreca enrca nerca crean rcean ceran ecran recan ercan craen rcaen caren acren racen arcen cearn ecarn caern acern eacrn aecrn reacn eracn raecn arecn earcn aercn crnae rcnae cnrae ncrae rncae nrcae crane rcane carne acrne racne arcne cnare ncare canre acnre nacre ancre rnace nrace rance arnce narce anrce cenar ecnar cnear ncear encar necar ceanr ecanr caenr acenr eacnr aecnr cnaer ncaer caner acner nacer ancer enacr neacr eancr aencr naecr anecr renac ernac rneac nreac enrac nerac reanc eranc raenc arenc earnc aernc rnaec nraec ranec arnec narec anrec enarc nearc eanrc aenrc naerc anerc
Note: these 'words' (valid or invalid) are all the permutations of the word crena. These words are obtained by scrambling the letters in crena.