code: def bit_reversal(qubits: List[int]) -> Program:
      
      p = Program()
      n = len(qubits)
      for i in range(int(n / 2)):
          p.inst(SWAP(qubits[i], qubits[-i - 1]))
      return p
docs: Generate a circuit to do bit reversal.
  
      :param qubits: Qubits to do bit reversal with.
      :return: A program to do bit reversal.