plnh lpnh pnlh nplh lnph nlph plhn lphn phln hpln lhpn hlpn pnhl nphl phnl hpnl nhpl hnpl lnhp nlhp lhnp hlnp nhlp hnlp
Note: these 'words' (valid or invalid) are all the permutations of the word plnh. These words are obtained by scrambling the letters in plnh.