serre esrre srere rsere ersre resre serre esrre srere rsere ersre resre srree rsree srree rsree rrsee rrsee errse rerse errse rerse rrese rrese serer esrer sreer rseer erser reser seerr eserr seerr eserr eesrr eesrr sreer rseer serer esrer reser erser eresr reesr eersr eersr reesr eresr serer esrer sreer rseer erser reser seerr eserr seerr eserr eesrr eesrr sreer rseer serer esrer reser erser eresr reesr eersr eersr reesr eresr srree rsree srree rsree rrsee rrsee srere rsere serre esrre resre ersre srere rsere serre esrre resre ersre rrese rrese rerse errse rerse errse erres reres erres reres rrees rrees erers reers eerrs eerrs reers erers erers reers eerrs eerrs reers erers rrees rrees reres erres reres erres
Note: these 'words' (valid or invalid) are all the permutations of the word serre. These words are obtained by scrambling the letters in serre.