Twee·dle·dum and Twee·dle·dee /ˌtwidḷˈdʌmən(d)ˌtwidḷˈdi/
  Twee·dle·dum and Twee·dle·dee Two things practically alike; -- a phrase coined by John Byrom (1692-1793) in his satire “On the Feuds between Handel and Bononcini.”
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  Tweedledum and Tweedledee
       n : any two people who are hard to tell apart [syn: Tweedledee
           and Tweedledum]