code: def get_orig_items(base):
      
      assert "group_orig" in base
      out = []
      for data_diff in base["group_orig"]:
          new = utils.deepish_copy(base)
          new.pop("group_orig")
          out.append(_patch_dict(data_diff, new))
      return out
docs: Retrieve original items from a diffed set of nested samples.