Optimal solution to COVRP instance P-20-2:
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Route = 1 10 4 11 15 12 3 18 17 8 13, Demand = 155, RLen = 101.405676
Route = 6 19 5 14 16 9 7 2, Demand = 155, RLen = 68.872658
Sum of route lengths = 170.278334
CAP = 160
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