ering reing eirng ierng rieng ireng ernig renig enrig nerig rneig nreig einrg ienrg enirg neirg inerg nierg rineg irneg rnieg nrieg inreg nireg erign reign eirgn iergn riegn iregn ergin regin egrin gerin rgein grein eigrn iegrn egirn geirn igern giern rigen irgen rgien grien igren giren erngi rengi enrgi nergi rnegi nregi ergni regni egrni gerni rgeni greni engri negri egnri genri ngeri gneri rngei nrgei rgnei grnei ngrei gnrei eingr iengr enigr neigr inegr niegr eignr iegnr eginr geinr igenr gienr engir negir egnir genir ngeir gneir inger niger igner giner ngier gnier ringe irnge rnige nrige inrge nirge rigne irgne rgine grine igrne girne rngie nrgie rgnie grnie ngrie gnrie ingre nigre ignre ginre ngire gnire
Note: these 'words' (valid or invalid) are all the permutations of the word ering. These words are obtained by scrambling the letters in ering.