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1. Four-element set from its triple sums ●●○○○ 20 ptsLet $A=\{a_1, a_2, a_3, a_4\}$ be a set of four numbers. The set $B=\{-1, 3, 5, 8\}$ consists of the sums of the elements of all the three-element subsets of $A$. Find the four elements of $A$, in increasing order.