murrs umrrs mrurs rmurs urmrs rumrs murrs umrrs mrurs rmurs urmrs rumrs mrrus rmrus mrrus rmrus rrmus rrmus urrms rurms urrms rurms rrums rrums mursr umrsr mrusr rmusr urmsr rumsr musrr umsrr msurr smurr usmrr sumrr mrsur rmsur msrur smrur rsmur srmur ursmr rusmr usrmr surmr rsumr srumr mursr umrsr mrusr rmusr urmsr rumsr musrr umsrr msurr smurr usmrr sumrr mrsur rmsur msrur smrur rsmur srmur ursmr rusmr usrmr surmr rsumr srumr mrrsu rmrsu mrrsu rmrsu rrmsu rrmsu mrsru rmsru msrru smrru rsmru srmru mrsru rmsru msrru smrru rsmru srmru rrsmu rrsmu rsrmu srrmu rsrmu srrmu urrsm rursm urrsm rursm rrusm rrusm ursrm rusrm usrrm surrm rsurm srurm ursrm rusrm usrrm surrm rsurm srurm rrsum rrsum rsrum srrum rsrum srrum
Note: these 'words' (valid or invalid) are all the permutations of the word murrs. These words are obtained by scrambling the letters in murrs.