rrews rrews rerws errws rerws errws rrwes rrwes rwres wrres rwres wrres rewrs erwrs rwers wrers ewrrs werrs rewrs erwrs rwers wrers ewrrs werrs rresw rresw rersw errsw rersw errsw rrsew rrsew rsrew srrew rsrew srrew resrw ersrw rserw srerw esrrw serrw resrw ersrw rserw srerw esrrw serrw rrwse rrwse rwrse wrrse rwrse wrrse rrswe rrswe rsrwe srrwe rsrwe srrwe rwsre wrsre rswre srwre wsrre swrre rwsre wrsre rswre srwre wsrre swrre rewsr erwsr rwesr wresr ewrsr wersr reswr erswr rsewr srewr esrwr serwr rwser wrser rswer srwer wsrer swrer ewsrr wesrr eswrr sewrr wserr swerr rewsr erwsr rwesr wresr ewrsr wersr reswr erswr rsewr srewr esrwr serwr rwser wrser rswer srwer wsrer swrer ewsrr wesrr eswrr sewrr wserr swerr
Note: these 'words' (valid or invalid) are all the permutations of the word rrews. These words are obtained by scrambling the letters in rrews.