ppens ppens pepns eppns pepns eppns ppnes ppnes pnpes nppes pnpes nppes penps epnps pneps npeps enpps nepps penps epnps pneps npeps enpps nepps ppesn ppesn pepsn eppsn pepsn eppsn ppsen ppsen pspen sppen pspen sppen pespn epspn psepn spepn esppn seppn pespn epspn psepn spepn esppn seppn ppnse ppnse pnpse nppse pnpse nppse ppsne ppsne pspne sppne pspne sppne pnspe npspe psnpe spnpe nsppe snppe pnspe npspe psnpe spnpe nsppe snppe pensp epnsp pnesp npesp enpsp nepsp pesnp epsnp psenp spenp espnp sepnp pnsep npsep psnep spnep nspep snpep enspp nespp esnpp senpp nsepp snepp pensp epnsp pnesp npesp enpsp nepsp pesnp epsnp psenp spenp espnp sepnp pnsep npsep psnep spnep nspep snpep enspp nespp esnpp senpp nsepp snepp
Note: these 'words' (valid or invalid) are all the permutations of the word ppens. These words are obtained by scrambling the letters in ppens.