fenis efnis fneis nfeis enfis nefis feins efins fiens ifens eifns iefns fnies nfies fines ifnes nifes infes enifs neifs einfs ienfs niefs inefs fensi efnsi fnesi nfesi enfsi nefsi fesni efsni fseni sfeni esfni sefni fnsei nfsei fsnei sfnei nsfei snfei ensfi nesfi esnfi senfi nsefi snefi feisn efisn fiesn ifesn eifsn iefsn fesin efsin fsein sfein esfin sefin fisen ifsen fsien sfien isfen sifen eisfn iesfn esifn seifn isefn siefn fnise nfise finse ifnse nifse infse fnsie nfsie fsnie sfnie nsfie snfie fisne ifsne fsine sfine isfne sifne nisfe insfe nsife snife isnfe sinfe enisf neisf einsf iensf niesf inesf ensif nesif esnif senif nseif sneif eisnf iesnf esinf seinf isenf sienf nisef insef nsief snief isnef sinef
Note: these 'words' (valid or invalid) are all the permutations of the word fenis. These words are obtained by scrambling the letters in fenis.