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#            1
#          ],
#          [
#            2,
#            0
#          ],
#          [
#            3,
#            0
#          ],
#          [
#            3,
#            1
#          ],
#          [
#            3,
#            2
#          ],
#          [
#            2,
#            2
#          ],
#          [
#            2,
#            3
#          ],
#          [
#            3,
#            3
#          ]
#        ], 'harder problem');

  $puzzle->set_position(
'1 14 10 4
5 0 6 8
9 11 2 12
13 7 3 15');

#  print "pvalue is ".$puzzle->value."\n";
  if (!($puzzle->distance_to_final_state)) {
#    print "s2 in final\n";
  }
  else {
#    print "s2 not in final\n";
  }

#  $fifteen_search->search({search_this=>$puzzle,
#   max_steps => 40000,
#   solutions_to_find=>1,
#   search_type => 'bfs',
#   do_not_repeat_values => 1,
#  });
#  is($fifteen_search->{steps}, 25211, 'number of steps');
#
#  $fifteen_search->search({search_this=>$puzzle,
#   max_steps => 40000,
#   solutions_to_find=>1,
#   search_type => 'bfs',
#   do_not_repeat_values => 1,
#  });
#  is($fifteen_search->{steps}, 25211, 'number of steps a second time');

  $fifteen_search->search({search_this=>$puzzle,
   max_steps => 20000,
   solutions_to_find=>1,
   search_type => 'bfs',
   do_not_repeat_values => 1,
  });
  is($fifteen_search->{steps}, 20000, 'number of steps 2');

  $fifteen_search->continue_search({additional_steps => 2000});
  is($fifteen_search->{steps}, 22000, 'number of steps 3');

  is($fifteen_search->{search_completed},0,'search not completed yet');

  $fifteen_search->continue_search({additional_steps => 3210});
  is($fifteen_search->{steps}, 25210, 'number of steps 4');

  is($fifteen_search->{search_completed},0,'search not completed ');

  $fifteen_search->continue_search({additional_steps => 2});
  is($fifteen_search->{steps}, 25211, 'number of steps 5');

  is($fifteen_search->{search_completed},1,'search completed ');

  is_deeply ( $fifteen_search->path,
       [
          [
            1,
            2
          ],
          [
            2,
            2
          ],
          [
            2,
            1
          ],
          [
            1,
            1
          ],
          [
            0,
            1
          ],
          [
            0,
            2
          ],
          [
            1,
            2
          ],
          [
            1,
            1
          ],
          [
            0,