code: public <T,E extends TypedEdge<T>> void write(
                          Multigraph<T,E> g, File f) throws IOException {
          write(g, f, null, false, null, false);
      }
docs: Writes the provided multigraph to the specified {@code gexf} file with
  all edge colors appearing the same.
  
  @param f the file where the {@code gexf} graph will be written.  Any existing file
  contents will be overwritten