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

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Text this: Testing for Functional Form and Heteroscedasticity