frere rfere ferre efrre refre erfre frree rfree frree rfree rrfee rrfee ferre efrre frere rfere erfre refre rerfe errfe rrefe rrefe errfe rerfe freer rfeer ferer efrer refer erfer freer rfeer ferer efrer refer erfer feerr eferr feerr eferr eefrr eefrr reefr erefr reefr erefr eerfr eerfr frree rfree frree rfree rrfee rrfee frere rfere ferre efrre refre erfre frere rfere ferre efrre refre erfre rrefe rrefe rerfe errfe rerfe errfe ferer efrer freer rfeer erfer refer feerr eferr feerr eferr eefrr eefrr freer rfeer ferer efrer refer erfer erefr reefr eerfr eerfr reefr erefr reref erref rreef rreef erref reref reerf ererf reerf ererf eerrf eerrf rreef rreef reref erref reref erref ererf reerf eerrf eerrf reerf ererf
Note: these 'words' (valid or invalid) are all the permutations of the word frere. These words are obtained by scrambling the letters in frere.