casdu acsdu csadu scadu ascdu sacdu cadsu acdsu cdasu dcasu adcsu dacsu csdau scdau cdsau dcsau sdcau dscau asdcu sadcu adscu dascu sdacu dsacu casud acsud csaud scaud ascud sacud causd acusd cuasd ucasd aucsd uacsd csuad scuad cusad ucsad sucad uscad asucd saucd auscd uascd suacd usacd cadus acdus cdaus dcaus adcus dacus cauds acuds cuads ucads aucds uacds cduas dcuas cudas ucdas ducas udcas aducs daucs audcs uadcs duacs udacs csdua scdua cdsua dcsua sdcua dscua csuda scuda cusda ucsda sucda uscda cdusa dcusa cudsa ucdsa ducsa udcsa sduca dsuca sudca usdca dusca udsca asduc saduc adsuc dasuc sdauc dsauc asudc saudc ausdc uasdc suadc usadc adusc dausc audsc uadsc duasc udasc sduac dsuac sudac usdac dusac udsac
Note: these 'words' (valid or invalid) are all the permutations of the word casdu. These words are obtained by scrambling the letters in casdu.