Given a list of space stations with their respective trade values, determine the maximum total trade value that can be achieved by either keeping the trade value of a station as is or replacing it with the difference between the total trade values of all previous stations and all subsequent stations.
Explanation: Step-by-step calculation: replace the first station's trade value with 25, and the last station's trade value with 25-22 = 3, and the second station's trade value with 25-3 = 22, and the third station's trade value with 22-7 = 15, and the fourth station's trade value with 22-11 = 11, and the fifth station's trade value with 15-2 = 13, giving output 25
Explanation: Step-by-step calculation: replace the first station's trade value with 10, and the last station's trade value with 10-5 = 5, and the second station's trade value with 10-5 = 5, and the third station's trade value with 5-8 = -3, and the fourth station's trade value with 5-3 = 2, and the fifth station's trade value with 5-1 = 4, giving output 10
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