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

[8, 46, 34, 18, 44, 31, 41, 40, 11, 24, 26, 19, 47, 27, 13, 9, 7, 36, 30, 20], target=51
[40, 11]

[35, 41, 6, 12, 18, 23, 2, 21, 46, 25, 5, 40, 48, 43, 49, 20, 26, 30, 27, 17], target=19
[2, 17]

[21, 12, 17, 6, 1, 39, 49, 9, 25, 45, 11, 19, 26, 48, 5, 10, 44, 46, 43, 8], target=16

[11, 5]