code: def select_candidates(config):
      
      download_candidates = []
  
      for group in config.group:
          summary_file = get_summary(config.section, group, config.uri, config.use_cache)
          entries = parse_summary(summary_file)
  
          for entry in filter_entries(entries, config):
              download_candidates.append((entry, group))
  
      return download_candidates
docs: Select candidates to download.
  
      Parameters
      ----------
      config: NgdConfig
          Runtime configuration object
  
      Returns
      -------
      list of (<candidate entry>, <taxonomic group>)