Maxima of difference between Primes!

Let \(a, \ b, \ c, \ (a+b-c), \ (a+c-b), \ (b+c-a), \ (a+b+c) \) be seven distinct prime numbers such that the sum of two of \(a,b,c\) is 800. Let \(d\) be the difference between the largest and the smallest numbers among the seven primes. Find the largest possible value of \(d\).

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