input: from typing import List
  
  def is_palindrome(s: str) -> bool:
      """
      This function returns True if the string s is a palindrome and False if it isn't.
      >>> is_palindrome("racecar")
      True
      >>> is_palindrome("hello")
      False
      """
      return s == s[::-1]  # Checks if s is the same as its reverse.
  
output:     for i in range(len(numbers)):
          for j in range(i + 1, len(numbers)):
              if abs(numbers[i] - numbers[j]) <= threshold:
                  return True
      return False