input: Write a function to determine if any two numbers from the given list sum up to the target number. If they do, return True, otherwise return False.
  def check_sum(numbers, target):
      for i in range(len(numbers)):
          for j in range(i+1, len(numbers)):
              if numbers[i] + numbers[j] == target:
                  return True
      return False
  
  assert check_sum([1, 2, 3, 4], 5)==True
  assert check_sum([1, 2, 3, 4], 8)==False
  assert check_sum([1, 3, 4, 2], 6)==True
  assert check_sum([1, 3, 4, 2], 10)==False
  assert check_sum([], 5)==False
output: def check_sum(numbers, target):
      for i in range(len(numbers)):
          for j in range(i+1, len(numbers)):
              if numbers[i] + numbers[j] == target:
                  return True
      return False