subv usbv sbuv bsuv ubsv busv suvb usvb svub vsub uvsb vusb sbvu bsvu svbu vsbu bvsu vbsu ubvs buvs uvbs vubs bvus vbus
Note: these 'words' (valid or invalid) are all the permutations of the word subv. These words are obtained by scrambling the letters in subv.