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The Thonnu
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Thunno 2 v, 6 bytes

ıʠ€ạ;ạ 

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Explanation

ıʠ€ạ;ạ # Implicit input ı ; # Map: ʠ # Powerset of the string € # For each one: ạ # Check if all equal ạ # Check if all equal # Implicit output 
The Thonnu
  • 18.7k
  • 3
  • 19
  • 76