ctsys tcsys cstys sctys tscys stcys ctyss tcyss cytss yctss tycss ytcss csyts scyts cysts ycsts sycts yscts tsycs stycs tyscs ytscs sytcs ystcs ctssy tcssy cstsy sctsy tscsy stcsy ctssy tcssy cstsy sctsy tscsy stcsy cssty scsty cssty scsty sscty sscty tsscy stscy tsscy stscy sstcy sstcy ctyss tcyss cytss yctss tycss ytcss ctsys tcsys cstys sctys tscys stcys cysts ycsts csyts scyts yscts sycts tyscs ytscs tsycs stycs ystcs sytcs csyst scyst cysst ycsst sycst yscst cssyt scsyt cssyt scsyt sscyt sscyt cysst ycsst csyst scyst yscst sycst sysct yssct ssyct ssyct yssct sysct tsysc stysc tyssc ytssc sytsc ystsc tssyc stsyc tssyc stsyc sstyc sstyc tyssc ytssc tsysc stysc ystsc sytsc systc ysstc ssytc ssytc ysstc systc
Note: these 'words' (valid or invalid) are all the permutations of the word ctsys. These words are obtained by scrambling the letters in ctsys.