idyll diyll iydll yidll dyill ydill idlyl dilyl ildyl lidyl dliyl ldiyl iyldl yildl ilydl liydl ylidl lyidl dylil ydlil dlyil ldyil yldil lydil idyll diyll iydll yidll dyill ydill idlyl dilyl ildyl lidyl dliyl ldiyl iyldl yildl ilydl liydl ylidl lyidl dylil ydlil dlyil ldyil yldil lydil idlly dilly ildly lidly dlily ldily idlly dilly ildly lidly dlily ldily illdy lildy illdy lildy llidy llidy dlliy ldliy dlliy ldliy lldiy lldiy iylld yilld ilyld liyld ylild lyild iylld yilld ilyld liyld ylild lyild illyd lilyd illyd lilyd lliyd lliyd yllid lylid yllid lylid llyid llyid dylli ydlli dlyli ldyli yldli lydli dylli ydlli dlyli ldyli yldli lydli dllyi ldlyi dllyi ldlyi lldyi lldyi ylldi lyldi ylldi lyldi llydi llydi
Note: these 'words' (valid or invalid) are all the permutations of the word idyll. These words are obtained by scrambling the letters in idyll.