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
Q: [20, 46, 12, 22, 35, 6, 4, 39, 14, 26, 10, 34, 41, 31, 43, 25, 7, 9, 28, 42], target=10
A: 
[6, 4]