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  ______     ___     _    _    __   __   _    _   
 /_   _//   / _ \\  | |  | ||  \ \\/ // | || | || 
   | ||    | / \ || | |/\| ||   \ ` //  | || | || 
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 /__//      \___//  |_// \_||    |_||    \____//  
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Text this: Regression analysis : a geometric approach