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

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Text this: Testing for Functional Form and Heteroscedasticity