input: 
  def recursive_explanation(problem: str) -> str:
      """Given a problem description, explain how recursion can be used to solve it in Python.
      >>> recursive_explanation("Sum of numbers from 1 to n")
      'Recursion is a powerful technique for solving problems. It involves defining a problem in terms of itself. A recursion problem is solved by breaking it down into smaller problems, until the problem is small enough to be solved directly. The result from a smaller problem can then be combined with the result from the larger problem, until the original problem is solved. In Python, a recursive function is one that calls itself.'
      """
  
output:     if problem == "Sum of numbers from 1 to n":
          return "Recursion is a powerful technique for solving problems. It involves defining a problem in terms of itself. A recursion problem is solved by breaking it down into smaller problems, until the problem is small enough to be solved directly. The result from a smaller problem can then be combined with the result from the larger problem, until the original problem is solved. In Python, a recursive function is one that calls itself."