ydrad dyrad yrdad rydad dryad rdyad ydard dyard yadrd aydrd dayrd adyrd yradd ryadd yardd ayrdd raydd arydd drayd rdayd daryd adryd radyd ardyd ydrda dyrda yrdda rydda dryda rdyda yddra dydra yddra dydra ddyra ddyra yrdda rydda ydrda dyrda rdyda dryda drdya rddya ddrya ddrya rddya drdya ydadr dyadr yaddr ayddr daydr adydr yddar dydar yddar dydar ddyar ddyar yaddr ayddr ydadr dyadr adydr daydr dadyr addyr ddayr ddayr addyr dadyr yradd ryadd yardd ayrdd raydd arydd yrdad rydad ydrad dyrad rdyad dryad yadrd aydrd ydard dyard adyrd dayrd radyd ardyd rdayd drayd adryd daryd drady rdady dardy adrdy raddy arddy drday rdday ddray ddray rdday drday dadry addry ddary ddary addry dadry raddy arddy rdady drady adrdy dardy
Note: these 'words' (valid or invalid) are all the permutations of the word ydrad. These words are obtained by scrambling the letters in ydrad.