Optimal solution to COVRP instance E-23-3:
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Route = 12 11 9 5 4 8 7 21, Demand = 3100, RLen = 160.390484
Route = 13 10, Demand = 4350, RLen = 34.411395
Route = 18 19 20 22 17 14 15 16 3 2 1 6, Demand = 2739, RLen = 248.181733
Sum of route lengths = 442.983612
CAP = 4500
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