\ http://pic.dhe.ibm.com/infocenter/cosinfoc/v12r3/topic/ilog.odms.cplex.help/Content/Optimization/Documentation/Optimization_Studio/_pubskel/ps_usrmancplex2051.html
Maximize
 obj: 12 x1 + 5 x2 + 15 x3 + 10 x4
Subject To
 c1: 5 x1 + x2 + 9 x3 + 12 x4 <= 15
Lazy Constraints
 l1: 2 x1 + 3 x2 + 4 x3 + x4 <= 10
 l2: 3 x1 + 2 x2 + 4 x3 + 10 x4 <= 8
Bounds
 0 <= x1 <= 5
 0 <= x2 <= 5
 0 <= x3 <= 5
 0 <= x4 <= 5
Generals
 x1  x2  x3  x4
End