cheka hceka cehka echka hecka ehcka chkea hckea ckhea kchea hkcea khcea cekha eckha ckeha kceha ekcha kecha hekca ehkca hkeca kheca ekhca kehca cheak hceak cehak echak hecak ehcak chaek hcaek cahek achek hacek ahcek ceahk ecahk caehk acehk eachk aechk heack ehack haeck aheck eahck aehck chkae hckae ckhae kchae hkcae khcae chake hcake cahke achke hacke ahcke ckahe kcahe cakhe ackhe kache akche hkace khace hakce ahkce kahce akhce cekah eckah ckeah kceah ekcah kecah ceakh ecakh caekh acekh eackh aeckh ckaeh kcaeh cakeh ackeh kaceh akceh ekach keach eakch aekch kaech akech hekac ehkac hkeac kheac ekhac kehac heakc ehakc haekc ahekc eahkc aehkc hkaec khaec hakec ahkec kahec akhec ekahc keahc eakhc aekhc kaehc akehc
Note: these 'words' (valid or invalid) are all the permutations of the word cheka. These words are obtained by scrambling the letters in cheka.