input: 
  def find_pair(lst: List[int], target: int) -> List[int]:
      """ Find a pair of numbers from the given list that add up to the given target.
      >>> find_pair([1, 2, 3, 4, 5], 8)
      [3, 5]
      >>> find_pair([1, 2, 3, 4, 5], 10)
      """
      for i in range(len(lst)):
          if (target - lst[i]) in lst[i+1:]:
              return [lst[i], target-lst[i]]
  
output:     return []