def METHOD_NAME(self):
    """
    Validates the state of this XBlock.
    """
    validation = super().METHOD_NAME()
    if self.get_parent().all_choice_values.count(self.value) > 1:
        validation.add(
            ValidationMessage(ValidationMessage.ERROR, self._(
                "This choice has a non-unique ID and won't work properly. "
                "This can happen if you duplicate a choice rather than use the Add Choice button."
            ))
        )
    print(self.get_parent().all_choice_values)
    return validation