fleet lfeet felet eflet lefet elfet fleet lfeet felet eflet lefet elfet feelt efelt feelt efelt eeflt eeflt leeft eleft leeft eleft eelft eelft flete lfete felte eflte lefte elfte fltee lftee ftlee tflee ltfee tlfee fetle eftle ftele tfele etfle tefle letfe eltfe ltefe tlefe etlfe telfe flete lfete felte eflte lefte elfte fltee lftee ftlee tflee ltfee tlfee fetle eftle ftele tfele etfle tefle letfe eltfe ltefe tlefe etlfe telfe feetl efetl feetl efetl eeftl eeftl fetel eftel fteel tfeel etfel tefel fetel eftel fteel tfeel etfel tefel eetfl eetfl etefl teefl etefl teefl leetf eletf leetf eletf eeltf eeltf letef eltef lteef tleef etlef telef letef eltef lteef tleef etlef telef eetlf eetlf etelf teelf etelf teelf
Note: these 'words' (valid or invalid) are all the permutations of the word fleet. These words are obtained by scrambling the letters in fleet.