function value = bigram_values ( )

%*****************************************************************************80
%
%% bigram_values() returns the value of each bigram.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    29 August 2021
%
%  Author:
%
%    John Burkardt
%
%  Output:
%
%    string VALUE(27,27): the bigram values.
%
  value = "";

  for i = 1 : 27

    if ( i < 27 )
      ci = char ( 'a' + i - 1 );
    else
      ci = '*';
    end

    for j = 1 : 26
      if ( j < 27 )
        cj = char ( 'a' + j - 1 );
      else
        cj = '*';
      end
      value(i,j) = string ( [ci,cj] );
    end
  end

  return
end
