murex umrex mruex rmuex urmex rumex muerx umerx meurx emurx uemrx eumrx mreux rmeux merux emrux remux ermux uremx ruemx uermx eurmx reumx erumx murxe umrxe mruxe rmuxe urmxe rumxe muxre umxre mxure xmure uxmre xumre mrxue rmxue mxrue xmrue rxmue xrmue urxme ruxme uxrme xurme rxume xrume muexr umexr meuxr emuxr uemxr eumxr muxer umxer mxuer xmuer uxmer xumer mexur emxur mxeur xmeur exmur xemur uexmr euxmr uxemr xuemr exumr xeumr mrexu rmexu merxu emrxu remxu ermxu mrxeu rmxeu mxreu xmreu rxmeu xrmeu mexru emxru mxeru xmeru exmru xemru rexmu erxmu rxemu xremu exrmu xermu urexm ruexm uerxm eurxm reuxm eruxm urxem ruxem uxrem xurem rxuem xruem uexrm euxrm uxerm xuerm exurm xeurm rexum erxum rxeum xreum exrum xerum
Note: these 'words' (valid or invalid) are all the permutations of the word murex. These words are obtained by scrambling the letters in murex.