Instances of the 2E-VRPTW

This instances set includes different instances with:

	4 different number of customers: 15, 30, 50, 100. 
	3 different combinations of number of depots and satellites: 2 depots and 3 satellites, 3 depots and 5 satellites, 6 depots and 4 satellites 
	4 different categories: Ca, Cb, Cc, Cd

Each instance is represented by a notation which consists of the associated category name, an index, number of depots, number of satellites and number of customers.
For example, "Ca3,2,3,15" denotes the third instance of the category "Ca", with 2 depots, 3 satellites and 15 customers.

Each text file contains:

	For each customer: x coordinate, y coordinate, start of time window, end of time window, demand size, service time
	For each satellite: x coordinate, y coordinate, service time
	For each depot: x coordinate, y coordinate, service time

Note that, the Vehicle capacity and cost for all instances are as follows:
	Urban vehicle capacity=200 
	Urban vehicle cost=50
	City freighter capacity=50 
	City freighter cost=25
