IA5String (FROM ("A".."Z"|"a".."z"))
            '''
            subtypeSpec = ConstraintsIntersection(
                PermittedAlphabetConstraint('A', 'Z'),
                PermittedAlphabetConstraint('a', 'z')
            )

        # this will succeed
        capital_and_small = CapitalAndSmall('Hello')

        # this will raise ValueConstraintError
        capital_and_small = CapitalAndSmall('hello')
    c