def get_id(self, version: int) -> str:
    if (version == 1):
        raise NoOldIdError()
    return (('DT' + self.expr.get_id(version)) + 'E')
def get_id(self, version: int) -> str:
    if (version == 1):
        raise NoOldIdError()
    return (('DT' + self.expr.get_id(version)) + 'E')