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 __   __     ___      ______     ___      _  __  
 \ \\/ //   / _ \\   /_____//   / _ \\   | |/ // 
  \   //   / //\ \\  `____ `   | / \ ||  | ' //  
  / . \\  |  ___  || /___//    | \_/ ||  | . \\  
 /_//\_\\ |_||  |_|| `__ `      \___//   |_|\_\\ 
 `-`  --` `-`   `-`  /_//       `---`    `-` --` 
                     `-`

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Text this: A Simpler Proof for the ϵ-δ Characterization of Baire Class One Functions