Optimal solution to COVRP instance E-22-4:
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Route = 10 9 7 5 2 1, Demand = 58, RLen = 67.600795
Route = 12 15 18 20 17, Demand = 59, RLen = 61.577238
Route = 13 11 8 6 3 4, Demand = 52, RLen = 77.964350
Route = 14 16 19 21, Demand = 56, RLen = 45.471440
Sum of route lengths = 252.613823
CAP = 60
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