docs: def process_mappings(self):
          """
          Process the mappings for a Frame Relay switch. Removes duplicates and
          adds the mappings to the node properties
          """
          for mapping_a in self.mappings:
              for mapping_b in self.mappings:
                  if mapping_a['source'] == mapping_b['dest']:
                      self.mappings.remove(mapping_b)
                      break
  
          self.node['properties']['mappings'] = {}
          mappings = self.node['properties']['mappings']
          for mapping in self.mappings:
              mappings[mapping['source']] = mapping['dest']