Gurobi 5.0.1 (linux64) logging started Mon Nov 19 06:43:21 2012

Optimize a model with 683 rows, 54 columns and 1366 nonzeros
Presolve removed 474 rows and 0 columns
Presolve time: 0.01s
Presolved: 209 rows, 54 columns, 1135 nonzeros
Variable types: 0 continuous, 54 integer (54 binary)
Found heuristic solution: objective 6.0000000

Root relaxation: objective 9.874488e+00, 119 iterations, 0.00 seconds

    Nodes    |    Current Node    |     Objective Bounds      |     Work
 Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time

     0     0    9.87449    0   51    6.00000    9.87449  64.6%     -    0s
H    0     0                       7.0000000    9.87449  41.1%     -    0s
     0     0    9.43923    0   52    7.00000    9.43923  34.8%     -    0s
     0     0    9.40893    0   51    7.00000    9.40893  34.4%     -    0s
     0     0    9.39970    0   53    7.00000    9.39970  34.3%     -    0s
     0     0    9.38758    0   52    7.00000    9.38758  34.1%     -    0s
     0     0    9.38307    0   53    7.00000    9.38307  34.0%     -    0s
     0     2    9.38292    0   53    7.00000    9.38292  34.0%     -    0s
*   23     3               3       8.0000000    9.02816  12.9%  25.1    0s

Cutting planes:
  Clique: 21
  Zero half: 9

Explored 27 nodes (816 simplex iterations) in 0.09 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.000000000000e+00, best bound 8.000000000000e+00, gap 0.0%