firer ifrer frier rfier irfer rifer fierr iferr feirr efirr iefrr eifrr freir rfeir ferir efrir refir erfir irefr riefr ierfr eirfr reifr erifr firre ifrre frire rfire irfre rifre firre ifrre frire rfire irfre rifre frrie rfrie frrie rfrie rrfie rrfie irrfe rirfe irrfe rirfe rrife rrife fierr iferr feirr efirr iefrr eifrr firer ifrer frier rfier irfer rifer ferir efrir freir rfeir erfir refir ierfr eirfr irefr riefr erifr reifr freri rferi ferri efrri refri erfri frrei rfrei frrei rfrei rrfei rrfei ferri efrri freri rferi erfri refri rerfi errfi rrefi rrefi errfi rerfi irerf rierf ierrf eirrf reirf erirf irref riref irref riref rrief rrief ierrf eirrf irerf rierf erirf reirf rerif errif rreif rreif errif rerif
Note: these 'words' (valid or invalid) are all the permutations of the word firer. These words are obtained by scrambling the letters in firer.