Build (method = -2) #dp: 146 Step-3' Graph: 12 vertices and 47 arcs (0.00s) Step-4' Graph: 8 vertices and 39 arcs (0.00s) #V4/#V3 = 0.67 #A4/#A3 = 0.83 Ready! (0.00s) Optimize a model with 28 rows, 40 columns and 109 nonzeros Presolve removed 28 rows and 40 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 6.800000000000e+01, best bound 6.800000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.01 seconds Objective: 68 Solution: 5 x [3] 1 x [14] 1 x [13, 14] 3 x [10, 13] 2 x [19] 1 x [17, 19] 9 x [6, 17] 9 x [11] 4 x [7] 4 x [2, 7] 4 x [20] 9 x [5, 9] 1 x [4] 7 x [4, 15] 3 x [1, 18] 1 x [1, 16] 1 x [8, 12] 2 x [12, 12] 1 x [5, 8]