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

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Text this: Flexible power point tracking for solar photovoltaic systems using secant method