rrweb rrweb rwreb wrreb rwreb wrreb rrewb rrewb rerwb errwb rerwb errwb rwerb wrerb rewrb erwrb werrb ewrrb rwerb wrerb rewrb erwrb werrb ewrrb rrwbe rrwbe rwrbe wrrbe rwrbe wrrbe rrbwe rrbwe rbrwe brrwe rbrwe brrwe rwbre wrbre rbwre brwre wbrre bwrre rwbre wrbre rbwre brwre wbrre bwrre rrebw rrebw rerbw errbw rerbw errbw rrbew rrbew rbrew brrew rbrew brrew rebrw erbrw rberw brerw ebrrw berrw rebrw erbrw rberw brerw ebrrw berrw rwebr wrebr rewbr erwbr werbr ewrbr rwber wrber rbwer brwer wbrer bwrer rebwr erbwr rbewr brewr ebrwr berwr webrr ewbrr wberr bwerr ebwrr bewrr rwebr wrebr rewbr erwbr werbr ewrbr rwber wrber rbwer brwer wbrer bwrer rebwr erbwr rbewr brewr ebrwr berwr webrr ewbrr wberr bwerr ebwrr bewrr
Note: these 'words' (valid or invalid) are all the permutations of the word rrweb. These words are obtained by scrambling the letters in rrweb.