frivl rfivl firvl ifrvl rifvl irfvl frvil rfvil fvril vfril rvfil vrfil fivrl ifvrl fvirl vfirl ivfrl vifrl rivfl irvfl rvifl vrifl ivrfl virfl frilv rfilv firlv ifrlv riflv irflv frliv rfliv flriv lfriv rlfiv lrfiv filrv iflrv flirv lfirv ilfrv lifrv rilfv irlfv rlifv lrifv ilrfv lirfv frvli rfvli fvrli vfrli rvfli vrfli frlvi rflvi flrvi lfrvi rlfvi lrfvi fvlri vflri flvri lfvri vlfri lvfri rvlfi vrlfi rlvfi lrvfi vlrfi lvrfi fivlr ifvlr fvilr vfilr ivflr viflr filvr iflvr flivr lfivr ilfvr lifvr fvlir vflir flvir lfvir vlfir lvfir ivlfr vilfr ilvfr livfr vlifr lvifr rivlf irvlf rvilf vrilf ivrlf virlf rilvf irlvf rlivf lrivf ilrvf lirvf rvlif vrlif rlvif lrvif vlrif lvrif ivlrf vilrf ilvrf livrf vlirf lvirf
Note: these 'words' (valid or invalid) are all the permutations of the word frivl. These words are obtained by scrambling the letters in frivl.