Examples
code = '303'
graph_descendants = get_descendants(code, output='graph')
graph_ancestors = get_ancestors(code, output='graph')
merged_graph = merge_graphs(list(graph_descendants, graph_ancestors))
code = '303'
graph_descendants = get_descendants(code, output='graph')
graph_ancestors = get_ancestors(code, output='graph')
merged_graph = merge_graphs(list(graph_descendants, graph_ancestors))