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

Optimize a model with 137 rows, 70 columns and 274 nonzeros
Presolve removed 60 rows and 21 columns
Presolve time: 0.00s
Presolved: 77 rows, 49 columns, 158 nonzeros
Variable types: 0 continuous, 49 integer (49 binary)
Found heuristic solution: objective 29.0000000

Root relaxation: objective 3.250000e+01, 59 iterations, 0.00 seconds

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

     0     0   32.50000    0   29   29.00000   32.50000  12.1%     -    0s
H    0     0                      31.0000000   32.50000  4.84%     -    0s
     0     0   32.00000    0   44   31.00000   32.00000  3.23%     -    0s
     0     0     cutoff    0        31.00000   31.99997  3.23%     -    0s

Cutting planes:
  Gomory: 1
  Clique: 19
  Zero half: 9

Explored 0 nodes (117 simplex iterations) in 0.01 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%