The route sheet for a part is given as follows: A-E-C-B-A-C. One thousand pieces will flow through from the first machine A to the final machine C following the given sequence. A unit load size of 50 is initially specified at the first machine and doubled after machine B. If one vehicle is used to transport the unit loads from machine to machine, determine the minimum number of trips that the vehicle has to make, assuming that the vehicle capacity is one unit load