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: [33, 13, 6, 40, 23, 3, 49, 10, 30, 8, 31, 38, 15, 5, 20, 9, 16, 19, 45, 12], target=25

[13, 12]