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: [16, 19, 21, 23, 15, 14, 4, 38, 41, 35, 27, 17, 43, 13, 34, 24, 31, 7, 20, 47], target=58

[27, 31]