docs: def mod_aggregate(low, chunks, running):
      '''
      The mod_aggregate function which looks up all rules in the available
      low chunks and merges them into a single rules ref in the present low data
      '''
      rules = []
      agg_enabled = [
              'append',
              'insert',
      ]
      if low.get('fun') not in agg_enabled:
          return low
      for chunk in chunks:
          tag = __utils__['state.gen_tag'](chunk)
          if tag in running:
              # Already ran the iptables state, skip aggregation
              continue
          if chunk.get('state') == 'iptables':
              if '__agg__' in chunk:
                  continue
              # Check for the same function
              if chunk.get('fun') != low.get('fun'):
                  continue
  
              if chunk not in rules:
                  rules.append(chunk)
                  chunk['__agg__'] = True
  
      if rules:
          if 'rules' in low:
              low['rules'].extend(rules)
          else:
              low['rules'] = rules
      return low