Definition: You are given a list of integers and an integer target, return a list of a pair of numbers in any order such that they add up to target. If there is no such pair of numbers, then return an empty list
Input: [24, 39, 27, 26, 28, 12, 20, 36, 34, 35, 6, 1, 25, 42, 15, 33, 8, 2, 21, 4], target=80

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