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

Ex Input:
[26, 3, 9, 6, 40, 30, 31, 12, 18, 45, 16, 23, 14, 1, 21, 44, 35, 19, 2, 43], target=77

Ex Output:
[]

Ex Input:
[10, 44, 42, 29, 17, 19, 39, 38, 35, 6, 11, 14, 40, 41, 47, 12, 22, 2, 15, 34], target=20

Ex Output:
[6, 14]

Ex Input:
[42, 7, 8, 49, 34, 48, 36, 22, 21, 28, 23, 38, 47, 31, 27, 6, 4, 5, 1, 29], target=67

Ex Output:
[36, 31]