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  ______     ___                ______   __   __  
 /_   _//   / _ \\    ____     /_   _//  \ \\/ // 
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 `--`     `-`   `-`  |_|`-`    `-----`   `-`  --` 
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Text this: Determination of some heavy metals in human hair by ultrasonic acid digestion and atomic absorption spectrophotometry