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: [10, 6, 3, 21, 4, 13, 2, 16, 41, 17, 26, 39, 37, 31, 29, 18, 15, 9, 45, 47], target=87
A: 
[]