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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 Validate(self, problems=default_problem_reporter):
 """Validate attribute values and this object's internal consistency. Returns: True iff all validation checks passed. """

    found_problem = False
    found_problem = ((not util.ValidateRequiredFieldsAreNotEmpty(
                          self, self._REQUIRED_FIELD_NAMES, problems))
                          or found_problem)
    found_problem = self.ValidateAgencyUrl(problems) or found_problem
    found_problem = self.ValidateAgencyLang(problems) or found_problem
    found_problem = self.ValidateAgencyTimezone(problems) or found_problem
    found_problem = self.ValidateAgencyFareUrl(problems) or found_problem
    found_problem = self.ValidateAgencyEmail(problems) or found_problem

    return not found_problem