input: def explain_recursion(problem: str) -> str:
      """ This function explains the concept of recursion in Python and 
      how it can solve a given problem by breaking it down into smaller 
      sub-problems.
      
      >>> explain_recursion('finding the factorial of a number')
      '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:     explanation = (
          "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."
      )
      return explanation