code: def merge_dimensions(dimensions_list):
      
      dvalues = defaultdict(list)
      dimensions = []
      for dims in dimensions_list:
          for d in dims:
              dvalues[d.name].append(d.values)
              if d not in dimensions:
                  dimensions.append(d)
      dvalues = {k: list(unique_iterator(itertools.chain(*vals)))
                 for k, vals in dvalues.items()}
      return [d(values=dvalues.get(d.name, [])) for d in dimensions]
docs: Merges lists of fully or partially overlapping dimensions by
      merging their values.
  
      >>> from holoviews import Dimension
      >>> dim_list = [[Dimension('A', values=[1, 2, 3]), Dimension('B')],
      ...             [Dimension('A', values=[2, 3, 4])]]
      >>> dimensions = merge_dimensions(dim_list)
      >>> dimensions
      [Dimension('A'), Dimension('B')]
      >>> dimensions[0].values
      [1, 2, 3, 4]