Build (method = -2) #dp: 73 Step-3' Graph: 20 vertices and 52 arcs (0.00s) Step-4' Graph: 4 vertices and 20 arcs (0.00s) #V4/#V3 = 0.20 #A4/#A3 = 0.38 Ready! (0.00s) Optimize a model with 13 rows, 21 columns and 60 nonzeros Presolve removed 13 rows and 21 columns Presolve time: 0.00s Explored 0 nodes (0 simplex iterations) in 0.00 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 5.000000000000e+01, best bound 5.000000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.01 seconds Objective: 50 Solution: 6 x [1, 2] 14 x [3, 4] 5 x [4, 6] 3 x [5, 7] 2 x [1, 7] 1 x [1, 9] 19 x [6, 8]