murks umrks mruks rmuks urmks rumks mukrs umkrs mkurs kmurs ukmrs kumrs mrkus rmkus mkrus kmrus rkmus krmus urkms rukms ukrms kurms rkums krums mursk umrsk mrusk rmusk urmsk rumsk musrk umsrk msurk smurk usmrk sumrk mrsuk rmsuk msruk smruk rsmuk srmuk ursmk rusmk usrmk surmk rsumk srumk muksr umksr mkusr kmusr ukmsr kumsr muskr umskr msukr smukr usmkr sumkr mksur kmsur mskur smkur ksmur skmur uksmr kusmr uskmr sukmr ksumr skumr mrksu rmksu mkrsu kmrsu rkmsu krmsu mrsku rmsku msrku smrku rsmku srmku mksru kmsru mskru smkru ksmru skmru rksmu krsmu rskmu srkmu ksrmu skrmu urksm ruksm ukrsm kursm rkusm krusm urskm ruskm usrkm surkm rsukm srukm uksrm kusrm uskrm sukrm ksurm skurm rksum krsum rskum srkum ksrum skrum
Note: these 'words' (valid or invalid) are all the permutations of the word murks. These words are obtained by scrambling the letters in murks.