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

Optimize a model with 689 rows, 52 columns and 1378 nonzeros
Presolve removed 483 rows and 0 columns
Presolve time: 0.01s
Presolved: 206 rows, 52 columns, 1199 nonzeros
Variable types: 0 continuous, 52 integer (52 binary)
Found heuristic solution: objective 5.0000000

Root relaxation: objective 8.906600e+00, 129 iterations, 0.00 seconds

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

     0     0    8.90660    0   49    5.00000    8.90660  78.1%     -    0s
H    0     0                       6.0000000    8.90660  48.4%     -    0s
     0     0    8.54951    0   47    6.00000    8.54951  42.5%     -    0s
     0     0    8.47236    0   51    6.00000    8.47236  41.2%     -    0s
     0     0    8.41267    0   49    6.00000    8.41267  40.2%     -    0s
     0     0    8.36755    0   51    6.00000    8.36755  39.5%     -    0s
     0     0    8.35518    0   51    6.00000    8.35518  39.3%     -    0s
     0     0    8.34704    0   52    6.00000    8.34704  39.1%     -    0s
     0     0    8.34652    0   51    6.00000    8.34652  39.1%     -    0s
     0     0    8.34537    0   52    6.00000    8.34537  39.1%     -    0s
     0     0    8.34537    0   52    6.00000    8.34537  39.1%     -    0s
     0     2    8.34505    0   52    6.00000    8.34505  39.1%     -    0s
*   20     6               6       7.0000000    8.27675  18.2%  29.6    0s

Cutting planes:
  Clique: 35
  Zero half: 5

Explored 27 nodes (990 simplex iterations) in 0.10 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.000000000000e+00, best bound 7.000000000000e+00, gap 0.0%