@classmethod
def CheckDoubleDigitAreaSubdistricts(cls, postcode):
    impacted_by_rule = False
    if postcode.outward_subdistrict:
        if (len(postcode.outward_area) == 2):
            allowed_subdistricts = cls.DoubleDigitAreaSubdistricts
            subdistrict = postcode.outward_subdistrict
            impacted_by_rule = (not (subdistrict in allowed_subdistricts))
    return impacted_by_rule
@classmethod
def CheckDoubleDigitAreaSubdistricts(cls, postcode):
    impacted_by_rule = False
    if postcode.outward_subdistrict:
        if (len(postcode.outward_area) == 2):
            allowed_subdistricts = cls.DoubleDigitAreaSubdistricts
            subdistrict = postcode.outward_subdistrict
            impacted_by_rule = (not (subdistrict in allowed_subdistricts))
    return impacted_by_rule