nappy anppy npapy pnapy apnpy panpy nappy anppy npapy pnapy apnpy panpy nppay pnpay nppay pnpay ppnay ppnay appny papny appny papny ppany ppany napyp anpyp npayp pnayp apnyp panyp naypp anypp nyapp ynapp aynpp yanpp npyap pnyap nypap ynpap pynap ypnap apynp paynp aypnp yapnp pyanp ypanp napyp anpyp npayp pnayp apnyp panyp naypp anypp nyapp ynapp aynpp yanpp npyap pnyap nypap ynpap pynap ypnap apynp paynp aypnp yapnp pyanp ypanp nppya pnpya nppya pnpya ppnya ppnya npypa pnypa nyppa ynppa pynpa ypnpa npypa pnypa nyppa ynppa pynpa ypnpa ppyna ppyna pypna yppna pypna yppna appyn papyn appyn papyn ppayn ppayn apypn paypn ayppn yappn pyapn ypapn apypn paypn ayppn yappn pyapn ypapn ppyan ppyan pypan yppan pypan yppan
Note: these 'words' (valid or invalid) are all the permutations of the word nappy. These words are obtained by scrambling the letters in nappy.