eches cehes ehces heces chees hcees ecehs ceehs eechs eechs ceehs ecehs ehecs heecs eehcs eehcs heecs ehecs chees hcees cehes eches heces ehces echse cehse ehcse hecse chese hcese ecshe ceshe esche seche csehe scehe ehsce hesce eshce sehce hsece shece chsee hcsee cshee schee hscee shcee ecesh ceesh eecsh eecsh ceesh ecesh ecseh ceseh esceh seceh cseeh sceeh eesch eesch esech seech esech seech ceseh ecseh cseeh sceeh esceh seceh ehesc heesc eehsc eehsc heesc ehesc ehsec hesec eshec sehec hseec sheec eeshc eeshc esehc seehc esehc seehc hesec ehsec hseec sheec eshec sehec chese hcese cehse echse hecse ehcse chsee hcsee cshee schee hscee shcee ceshe ecshe csehe scehe esche seche hesce ehsce hsece shece eshce sehce
Note: these 'words' (valid or invalid) are all the permutations of the word eches. These words are obtained by scrambling the letters in eches.