----------------  SOLUTION  -------------------

solution cost   : 861.787
number of trips : 14

trip 1, 2 customers, sequence : 4 2 
   weight    : 56
   volume    : 2
   trip cost : 34.3592

trip 2, 2 customers, sequence : 9 32 
   weight    : 57
   volume    : 2
   trip cost : 53.0156

trip 3, 3 customers, sequence : 17 16 6 
   weight    : 58
   volume    : 3
   trip cost : 43.8695

trip 4, 3 customers, sequence : 34 14 35 
   weight    : 60
   volume    : 3
   trip cost : 58.7359

trip 5, 4 customers, sequence : 15 20 37 36 
   weight    : 56
   volume    : 4
   trip cost : 84.9722

trip 6, 3 customers, sequence : 30 5 29 
   weight    : 56
   volume    : 3
   trip cost : 52.8815

trip 7, 3 customers, sequence : 39 31 26 
   weight    : 59
   volume    : 3
   trip cost : 76.0974

trip 8, 2 customers, sequence : 10 38 
   weight    : 50
   volume    : 2
   trip cost : 59.9258

trip 9, 3 customers, sequence : 12 40 3 
   weight    : 60
   volume    : 3
   trip cost : 47.1246

trip 10, 2 customers, sequence : 21 28 
   weight    : 57
   volume    : 2
   trip cost : 61.2968

trip 11, 3 customers, sequence : 33 1 22 
   weight    : 57
   volume    : 3
   trip cost : 66.1294

trip 12, 4 customers, sequence : 8 19 13 27 
   weight    : 60
   volume    : 4
   trip cost : 59.6537

trip 13, 4 customers, sequence : 25 18 24 23 
   weight    : 60
   volume    : 4
   trip cost : 104.617

trip 14, 2 customers, sequence : 7 11 
   weight    : 52
   volume    : 2
   trip cost : 59.1083