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

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Text this: Hydroxyapatite: Hexagonal or monoclinic?