Q: 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
[20, 21, 23, 47, 16, 6, 40, 45, 44, 17, 9, 33, 25, 39, 35, 27, 34, 13, 37, 10], target=30
A:
[21, 9]