function L = digraph_arc_example_cycler ( )

%*****************************************************************************80
%
%% digraph_arc_example_cycler() returns the arc list for a 9-node example.
%
%  Diagram:
%  
%           A
%           V
%    9--><--7---<--3--><---4
%    |            /|      /
%    V           A |     /
%    |          /  |    /
%    5----<----1   V   A
%    |        /    |  /
%    V       A     | /
%    |      /      |/
%    2-->---8---<--6
%     \------>----/
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    17 April 2026
%
%  Author:
%
%    John Burkardt
%
%  Output:
%
%    integer L(16,2), the arc list.
%
  arc_num = 16;

  L = [ 1, 1, 2, 2, 3, 3, 3, 4, 5, 6, 6, 7, 7, 8, 9, 9;
        3, 5, 6, 8, 4, 6, 7, 3, 2, 4, 8, 7, 9, 1, 5, 7 ]';

  return
end
