code: def _get_MRIO_system(path):
      
      ispxp = True if re.search('pxp', path, flags=re.IGNORECASE) else False
      isixi = True if re.search('ixi', path, flags=re.IGNORECASE) else False
  
      if ispxp == isixi:
          system = None
      else:
          system = 'pxp' if ispxp else 'ixi'
      return system
docs: Extract system information (ixi, pxp) from file path.
  
      Returns 'ixi' or 'pxp', None in undetermined