input: def solve_problem_recursively(problem):
      """
      This function describes how to use recursion to solve a given problem in Python.
      It explains that recursion involves breaking down the problem into smaller problems,
      solving these smaller problems, and then combining their results to solve the original problem.
      
      Example:
      >>> solve_problem_recursively("Explain recursion")
      '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 == "Explain recursion":
          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."
      else:
          return "The problem is not recognized."