code: def reset_all_to_coefficients(self):
          
          self.reset_to_coefficients()
          [ee.reset_to_coefficients() for ee in self.get_extensions(data=True)]
          self.meta._add_modify("Reset full system to coefficients")
          return self
docs: Resets the IOSystem and all extensions to coefficients.
  
          This method calls reset_to_coefficients for the IOSystem and for
          all Extensions in the system
  
          Note
          -----
  
          The system can not be reconstructed after this steps
          because all absolute data is removed. Save the Y data in case
          a reconstruction might be necessary.