exhi xehi ehxi hexi xhei hxei exih xeih eixh iexh xieh ixeh ehix heix eihx iehx hiex ihex xhie hxie xihe ixhe hixe ihxe
Note: these 'words' (valid or invalid) are all the permutations of the word exhi. These words are obtained by scrambling the letters in exhi.