Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:01 2012

Optimize a model with 127 rows, 67 columns and 254 nonzeros
Presolve removed 41 rows and 15 columns
Presolve time: 0.00s
Presolved: 86 rows, 52 columns, 174 nonzeros
Variable types: 0 continuous, 52 integer (52 binary)
Found heuristic solution: objective 29.0000000

Root relaxation: objective 3.233333e+01, 68 iterations, 0.00 seconds

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

     0     0   32.33333    0   52   29.00000   32.33333  11.5%     -    0s
H    0     0                      31.0000000   32.33333  4.30%     -    0s
     0     0 infeasible    0        31.00000   31.99997  3.23%     -    0s

Cutting planes:
  Zero half: 16

Explored 0 nodes (91 simplex iterations) in 0.00 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.100000000000e+01, best bound 3.100000000000e+01, gap 0.0%