Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:38 2012

Optimize a model with 89 rows, 46 columns and 178 nonzeros
Presolve removed 41 rows and 15 columns
Presolve time: 0.00s
Presolved: 48 rows, 31 columns, 102 nonzeros
Variable types: 0 continuous, 31 integer (31 binary)
Found heuristic solution: objective 20.0000000

Root relaxation: objective 2.133333e+01, 31 iterations, 0.00 seconds

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

     0     0   21.33333    0   23   20.00000   21.33333  6.67%     -    0s
H    0     0                      21.0000000   21.33333  1.59%     -    0s

Explored 0 nodes (35 simplex iterations) in 0.00 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.100000000000e+01, best bound 2.100000000000e+01, gap 0.0%