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: [7, 31, 32, 11, 46, 40, 15, 9, 13, 45, 48, 44, 33, 6, 5, 27, 17, 43, 18, 42], target=56

[11, 45]