wakf awkf wkaf kwaf akwf kawf wafk awfk wfak fwak afwk fawk wkfa kwfa wfka fwka kfwa fkwa akfw kafw afkw fakw kfaw fkaw
Note: these 'words' (valid or invalid) are all the permutations of the word wakf. These words are obtained by scrambling the letters in wakf.