pannd apnnd pnand npand anpnd napnd pannd apnnd pnand npand anpnd napnd pnnad npnad pnnad npnad nnpad nnpad annpd nanpd annpd nanpd nnapd nnapd pandn apndn pnadn npadn anpdn napdn padnn apdnn pdann dpann adpnn dapnn pndan npdan pdnan dpnan ndpan dnpan andpn nadpn adnpn danpn ndapn dnapn pandn apndn pnadn npadn anpdn napdn padnn apdnn pdann dpann adpnn dapnn pndan npdan pdnan dpnan ndpan dnpan andpn nadpn adnpn danpn ndapn dnapn pnnda npnda pnnda npnda nnpda nnpda pndna npdna pdnna dpnna ndpna dnpna pndna npdna pdnna dpnna ndpna dnpna nndpa nndpa ndnpa dnnpa ndnpa dnnpa anndp nandp anndp nandp nnadp nnadp andnp nadnp adnnp dannp ndanp dnanp andnp nadnp adnnp dannp ndanp dnanp nndap nndap ndnap dnnap ndnap dnnap
Note: these 'words' (valid or invalid) are all the permutations of the word pannd. These words are obtained by scrambling the letters in pannd.