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Let A = { 1 , a 1 , a 2 . . . . a 1 8 , 7 7 }  be a set of integers with 1 < a1 < a2 < … < a18 < 77. Let the set A + A = { x + y : x , y ∈ A }  contains exactly 39 elements. Then, the value of a1 + a2 +….. + a18 is equal to…………

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