apayd paayd aapyd aapyd paayd apayd apyad payad aypad yapad pyaad ypaad aaypd aaypd ayapd yaapd ayapd yaapd payad apyad pyaad ypaad aypad yapad apady paady aapdy aapdy paady apady apday paday adpay dapay pdaay dpaay aadpy aadpy adapy daapy adapy daapy paday apday pdaay dpaay adpay dapay apyda payda aypda yapda pyada ypada apdya padya adpya dapya pdaya dpaya aydpa yadpa adypa daypa ydapa dyapa pydaa ypdaa pdyaa dpyaa ydpaa dypaa aaydp aaydp ayadp yaadp ayadp yaadp aadyp aadyp adayp daayp adayp daayp aydap yadap adyap dayap ydaap dyaap aydap yadap adyap dayap ydaap dyaap payda apyda pyada ypada aypda yapda padya apdya pdaya dpaya adpya dapya pydaa ypdaa pdyaa dpyaa ydpaa dypaa aydpa yadpa adypa daypa ydapa dyapa
Note: these 'words' (valid or invalid) are all the permutations of the word apayd. These words are obtained by scrambling the letters in apayd.