mysid ymsid msyid smyid ysmid symid myisd ymisd miysd imysd yimsd iymsd msiyd smiyd misyd imsyd simyd ismyd ysimd syimd yismd iysmd siymd isymd mysdi ymsdi msydi smydi ysmdi symdi mydsi ymdsi mdysi dmysi ydmsi dymsi msdyi smdyi mdsyi dmsyi sdmyi dsmyi ysdmi sydmi ydsmi dysmi sdymi dsymi myids ymids miyds imyds yimds iymds mydis ymdis mdyis dmyis ydmis dymis midys imdys mdiys dmiys idmys dimys yidms iydms ydims dyims idyms diyms msidy smidy misdy imsdy simdy ismdy msdiy smdiy mdsiy dmsiy sdmiy dsmiy midsy imdsy mdisy dmisy idmsy dimsy sidmy isdmy sdimy dsimy idsmy dismy ysidm syidm yisdm iysdm siydm isydm ysdim sydim ydsim dysim sdyim dsyim yidsm iydsm ydism dyism idysm diysm sidym isdym sdiym dsiym idsym disym
Note: these 'words' (valid or invalid) are all the permutations of the word mysid. These words are obtained by scrambling the letters in mysid.