code: def build_spia_matrices(nodes: Set[str]) -> Dict[str, pd.DataFrame]:
      
      nodes = list(sorted(nodes))
  
      # Create sheets of the excel in the given order
      matrices = OrderedDict()
      for relation in KEGG_RELATIONS:
          matrices[relation] = pd.DataFrame(0, index=nodes, columns=nodes)
  
      return matrices
docs: Build an adjacency matrix for each KEGG relationship and return in a dictionary.
  
      :param nodes: A set of HGNC gene symbols
      :return: Dictionary of adjacency matrix for each relationship