code: def option_intersections(backend):
      intersections = []
      options = Store.options(backend)
      for k, opts in sorted(options.items()):
          if len(k) > 1:
              continue
          valid_options = {
              k: set(o.allowed_keywords) for k, o in opts.groups.items()
          }
          for g1, g2 in combinations(Options._option_groups, 2):
              intersection = valid_options[g1] & valid_options[g2]
              if intersection:
                  intersections.append((k, intersection))
      return intersections
  
label_desc: Use image node_id 1 for calling a global function with example usage: option_intersections(backend) and returns: intersections