ytvr tyvr yvtr vytr tvyr vtyr ytrv tyrv yrtv rytv tryv rtyv yvrt vyrt yrvt ryvt vryt rvyt tvry vtry trvy rtvy vrty rvty
Note: these 'words' (valid or invalid) are all the permutations of the word ytvr. These words are obtained by scrambling the letters in ytvr.