Gurobi 5.0.1 (linux64) logging started Fri Nov 16 12:12:33 2012

Optimize a model with 17962 rows, 5112 columns and 58644 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.61s
Presolved: 18031 rows, 5110 columns, 63179 nonzeros
Variable types: 0 continuous, 5110 integer (5110 binary)
Found heuristic solution: objective 71.0000000

Root relaxation: objective 2.000000e+00, 3557 iterations, 0.15 seconds

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

     0     0    2.00000    0  142   71.00000    2.00000  97.2%     -    1s
H    0     0                      69.0000000    2.00000  97.1%     -    1s
H    0     0                       5.0000000    2.00000  60.0%     -    1s
     0     0    2.66667    0 1849    5.00000    2.66667  46.7%     -    8s
H    0     0                       4.0000000    2.66667  33.3%     -   13s
     0     0    2.66667    0  179    4.00000    2.66667  33.3%     -   17s
     0     2    2.66667    0  179    4.00000    2.66667  33.3%     -   19s
     1     3    3.00000    1  136    4.00000    2.66667  33.3%  5066   20s

Cutting planes:
  Clique: 80

Explored 23 nodes (70632 simplex iterations) in 23.62 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%