CPLEX> read opg6.lp
Problem 'opg6.lp' read.
Read time =    0.03 sec.
CPLEX> opt
Tried aggregator 1 time.
No MIP presolve or aggregator reductions.
Presolve time =    0.00 sec.
Pseudo-cost variable selection.
Objective is integral.

        Nodes                                         Cuts/
   Node  Left     Objective  IInf  Best Integer     Best Node    ItCnt

      0     0       15.4000     8                     15.4000       28
                    14.6607    12                  Covers:  7       37
*    18    10        8.0000     0        8.0000       14.6000       86
*    26     8       12.0000     0       12.0000       14.1923      107
*                   13.0000     0       13.0000    Covers:  1      139

Cover cuts applied:  22

Integer optimal solution:  Objective =    1.3000000000e+01
Solution time =    0.03 sec.  Iterations = 139  Nodes = 29

CPLEX> dis sol var -
Variable Name           Solution Value
x2                            1.000000
x3                            1.000000
x4                            1.000000
x8                            1.000000
x9                            1.000000
x10                           1.000000
x11                           1.000000
x12                           1.000000
x13                           1.000000
x14                           1.000000
d3                            1.000000
d5                            1.000000
d6                            1.000000
d7                            1.000000
d2                            1.000000
d4                            1.000000
d9                            1.000000
d10                           1.000000
All other variables in the range 1-27 are zero.