cases acses csaes scaes asces saces caess acess ceass ecass aecss eacss cseas sceas cesas ecsas secas escas asecs saecs aescs eascs seacs esacs casse acsse csase scase ascse sacse casse acsse csase scase ascse sacse cssae scsae cssae scsae sscae sscae assce sasce assce sasce ssace ssace caess acess ceass ecass aecss eacss cases acses csaes scaes asces saces cesas ecsas cseas sceas escas secas aescs eascs asecs saecs esacs seacs csesa scesa cessa ecssa secsa escsa cssea scsea cssea scsea sscea sscea cessa ecssa csesa scesa escsa secsa sesca essca sseca sseca essca sesca asesc saesc aessc eassc seasc esasc assec sasec assec sasec ssaec ssaec aessc eassc asesc saesc esasc seasc sesac essac sseac sseac essac sesac
Note: these 'words' (valid or invalid) are all the permutations of the word cases. These words are obtained by scrambling the letters in cases.