npine pnine nipne inpne pinne ipnne npnie pnnie nnpie nnpie pnnie npnie ninpe innpe nnipe nnipe innpe ninpe pinne ipnne pnine npine inpne nipne npien pnien nipen inpen pinen ipnen npein pnein nepin enpin penin epnin niepn inepn neipn enipn ienpn einpn pienn ipenn peinn epinn iepnn eipnn npnei pnnei nnpei nnpei pnnei npnei npeni pneni nepni enpni penni epnni nnepi nnepi nenpi ennpi nenpi ennpi pneni npeni penni epnni nepni enpni ninep innep nniep nniep innep ninep nienp inenp neinp eninp iennp einnp nneip nneip nenip ennip nenip ennip inenp nienp iennp einnp neinp eninp pinen ipnen pnien npien inpen nipen pienn ipenn peinn epinn iepnn eipnn pnein npein penin epnin nepin enpin inepn niepn ienpn einpn neipn enipn
Note: these 'words' (valid or invalid) are all the permutations of the word npine. These words are obtained by scrambling the letters in npine.