wpsn pwsn wspn swpn pswn spwn wpns pwns wnps nwps pnws npws wsnp swnp wnsp nwsp snwp nswp psnw spnw pnsw npsw snpw nspw
Note: these 'words' (valid or invalid) are all the permutations of the word wpsn. These words are obtained by scrambling the letters in wpsn.