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

Optimize a model with 641 rows, 51 columns and 1282 nonzeros
Presolve removed 438 rows and 0 columns
Presolve time: 0.01s
Presolved: 203 rows, 51 columns, 1144 nonzeros
Variable types: 0 continuous, 51 integer (51 binary)
Found heuristic solution: objective 6.0000000

Root relaxation: objective 9.071623e+00, 94 iterations, 0.00 seconds

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

     0     0    9.07162    0   43    6.00000    9.07162  51.2%     -    0s
H    0     0                       7.0000000    9.07162  29.6%     -    0s
     0     0    8.79570    0   45    7.00000    8.79570  25.7%     -    0s
     0     0    8.74435    0   46    7.00000    8.74435  24.9%     -    0s
     0     0    8.72750    0   48    7.00000    8.72750  24.7%     -    0s
     0     0    8.71601    0   47    7.00000    8.71601  24.5%     -    0s
     0     0    8.71507    0   49    7.00000    8.71507  24.5%     -    0s
     0     0    8.71413    0   47    7.00000    8.71413  24.5%     -    0s
     0     0    8.71277    0   47    7.00000    8.71277  24.5%     -    0s
     0     2    8.71192    0   47    7.00000    8.71192  24.5%     -    0s
*   11     1               2       8.0000000    8.15000  1.88%  30.7    0s

Cutting planes:
  Clique: 20
  Zero half: 7

Explored 12 nodes (571 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%