reddf erddf rdedf dredf edrdf derdf reddf erddf rdedf dredf edrdf derdf rddef drdef rddef drdef ddref ddref eddrf dedrf eddrf dedrf dderf dderf redfd erdfd rdefd drefd edrfd derfd refdd erfdd rfedd fredd efrdd ferdd rdfed drfed rfded frded dfred fdred edfrd defrd efdrd fedrd dferd fderd redfd erdfd rdefd drefd edrfd derfd refdd erfdd rfedd fredd efrdd ferdd rdfed drfed rfded frded dfred fdred edfrd defrd efdrd fedrd dferd fderd rddfe drdfe rddfe drdfe ddrfe ddrfe rdfde drfde rfdde frdde dfrde fdrde rdfde drfde rfdde frdde dfrde fdrde ddfre ddfre dfdre fddre dfdre fddre eddfr dedfr eddfr dedfr ddefr ddefr edfdr defdr efddr feddr dfedr fdedr edfdr defdr efddr feddr dfedr fdedr ddfer ddfer dfder fdder dfder fdder
Note: these 'words' (valid or invalid) are all the permutations of the word reddf. These words are obtained by scrambling the letters in reddf.