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: [17, 30, 8, 1, 12, 26, 35, 3, 37, 39, 38, 11, 14, 16, 6, 40, 25, 19, 42, 4], target=77

[38, 39]