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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_iam_policy(self):
 """Return the current IAM policy as a json-serialized string"""

        checker = AwsLimitChecker()
        policy = checker.get_required_iam_policy()
        return json.dumps(policy, sort_keys=True, indent=2)