mechs emchs mcehs cmehs ecmhs cemhs mehcs emhcs mhecs hmecs ehmcs hemcs mches cmhes mhces hmces chmes hcmes echms cehms ehcms hecms chems hcems mecsh emcsh mcesh cmesh ecmsh cemsh mesch emsch msech smech esmch semch mcseh cmseh msceh smceh csmeh scmeh ecsmh cesmh escmh secmh csemh scemh mehsc emhsc mhesc hmesc ehmsc hemsc meshc emshc msehc smehc esmhc semhc mhsec hmsec mshec smhec hsmec shmec ehsmc hesmc eshmc sehmc hsemc shemc mchse cmhse mhcse hmcse chmse hcmse mcshe cmshe msche smche csmhe scmhe mhsce hmsce mshce smhce hsmce shmce chsme hcsme cshme schme hscme shcme echsm cehsm ehcsm hecsm chesm hcesm ecshm ceshm eschm sechm csehm scehm ehscm hescm eshcm sehcm hsecm shecm chsem hcsem cshem schem hscem shcem
Note: these 'words' (valid or invalid) are all the permutations of the word mechs. These words are obtained by scrambling the letters in mechs.