droid rdoid dorid odrid rodid ordid driod rdiod dirod idrod ridod irdod doird odird diord idord oidrd iodrd roidd oridd riodd irodd oirdd iordd drodi rdodi dordi odrdi roddi orddi drdoi rddoi ddroi ddroi rddoi drdoi dodri oddri ddori ddori oddri dodri roddi orddi rdodi drodi odrdi dordi drido rdido dirdo idrdo riddo irddo drdio rddio ddrio ddrio rddio drdio didro iddro ddiro ddiro iddro didro riddo irddo rdido drido idrdo dirdo doidr odidr diodr idodr oiddr ioddr dodir oddir ddoir ddoir oddir dodir didor iddor ddior ddior iddor didor oiddr ioddr odidr doidr idodr diodr roidd oridd riodd irodd oirdd iordd rodid ordid rdoid droid odrid dorid ridod irdod rdiod driod idrod dirod oidrd iodrd odird doird idord diord
Note: these 'words' (valid or invalid) are all the permutations of the word droid. These words are obtained by scrambling the letters in droid.