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: [34, 12, 24, 21, 25, 35, 13, 11, 40, 30, 2, 32, 1, 7, 31, 14, 33, 42, 22, 20], target=41

[7, 34]