sarks asrks sraks rsaks arsks rasks sakrs askrs skars ksars aksrs kasrs srkas rskas skras ksras rksas krsas arkss rakss akrss karss rkass krass sarsk asrsk srask rsask arssk rassk sasrk assrk ssark ssark assrk sasrk srsak rssak ssrak ssrak rssak srsak arssk rassk asrsk sarsk rsask srask saksr asksr skasr ksasr akssr kassr saskr asskr ssakr ssakr asskr saskr sksar kssar sskar sskar kssar sksar akssr kassr asksr saksr ksasr skasr srksa rsksa skrsa ksrsa rkssa krssa srska rsska ssrka ssrka rsska srska sksra kssra sskra sskra kssra sksra rkssa krssa rsksa srksa ksrsa skrsa arkss rakss akrss karss rkass krass arsks rasks asrks sarks rsaks sraks aksrs kasrs askrs sakrs ksars skars rksas krsas rskas srkas ksras skras
Note: these 'words' (valid or invalid) are all the permutations of the word sarks. These words are obtained by scrambling the letters in sarks.