heval ehval hveal vheal evhal vehal heavl ehavl haevl ahevl eahvl aehvl hvael vhael havel ahvel vahel avhel evahl veahl eavhl aevhl vaehl avehl hevla ehvla hvela vhela evhla vehla helva ehlva hleva lheva elhva lehva hvlea vhlea hlvea lhvea vlhea lvhea evlha velha elvha levha vleha lveha healv ehalv haelv ahelv eahlv aehlv helav ehlav hleav lheav elhav lehav halev ahlev hlaev lhaev alhev lahev ealhv aelhv elahv leahv alehv laehv hvale vhale havle ahvle vahle avhle hvlae vhlae hlvae lhvae vlhae lvhae halve ahlve hlave lhave alhve lahve valhe avlhe vlahe lvahe alvhe lavhe evalh vealh eavlh aevlh vaelh avelh evlah velah elvah levah vleah lveah ealvh aelvh elavh leavh alevh laevh valeh avleh vlaeh lvaeh alveh laveh
Note: these 'words' (valid or invalid) are all the permutations of the word heval. These words are obtained by scrambling the letters in heval.