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

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Text this: On the operator bk related to the bessel heat equation