ridyl irdyl rdiyl driyl idryl diryl riydl irydl ryidl yridl iyrdl yirdl rdyil dryil rydil yrdil dyril ydril idyrl diyrl iydrl yidrl dyirl ydirl ridly irdly rdily drily idrly dirly rildy irldy rlidy lridy ilrdy lirdy rdliy drliy rldiy lrdiy dlriy ldriy idlry dilry ildry lidry dliry ldiry riyld iryld ryild yrild iyrld yirld rilyd irlyd rliyd lriyd ilryd liryd rylid yrlid rlyid lryid ylrid lyrid iylrd yilrd ilyrd liyrd ylird lyird rdyli dryli rydli yrdli dyrli ydrli rdlyi drlyi rldyi lrdyi dlryi ldryi ryldi yrldi rlydi lrydi ylrdi lyrdi dylri ydlri dlyri ldyri yldri lydri idylr diylr iydlr yidlr dyilr ydilr idlyr dilyr ildyr lidyr dliyr ldiyr iyldr yildr ilydr liydr ylidr lyidr dylir ydlir dlyir ldyir yldir lydir
Note: these 'words' (valid or invalid) are all the permutations of the word ridyl. These words are obtained by scrambling the letters in ridyl.