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: [22, 23, 45, 37, 25, 10, 2, 18, 17, 20, 3, 34, 13, 21, 28, 39, 31, 43, 33, 40], target=100

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