function L = digraph_arc_example_sauer ( )

%*****************************************************************************80
%
%% digraph_arc_example_sauer() returns the arc list for the Sauer example.
%
%  Discussion:
%
%    This matrix appears on page 564 of the reference.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    17 April 2026
%
%  Author:
%
%    John Burkardt
%
%  Reference:
%
%    Timothy Sauer,
%    Numerical Analysis,
%    Pearson, 2006,
%    ISBN: 0-321-26898-9,
%    LC: QA297.S348
%
%  Output:
%
%    integer L(34,2), the arc list.
%
  arc_num = 34;

  L = [ 5,  1,  3,  2,  4,  8,  2,  9,  3,  9, ...
        2, 12,  3, 12,  1, 13,  5,  6,  7,  9, ...
       14,  6,  7,  8, 12, 14,  4, 15, 10, 14, ...
       13, 15, 11, 14;                         ...
        1,  2,  2,  3,  3,  4,  5,  5,  6,  6, ...
        7,  7,  8,  8,  9,  9, 10, 10, 10, 10, ...
       10, 11, 11, 11, 11, 11, 12, 12, 13, 13, ...
       14, 14, 15, 15 ];

  return
end

