@abc.abstractmethod<EOL><INDENT>def unassign_assessment_taken_from_bank(self, assessment_taken_id, bank_id):<DEDENT>
pass<EOL>
Removes an ``AssessmentTaken`` from a ``Bank``.

        :param assessment_taken_id: the ``Id`` of the ``AssessmentTaken``
        :type assessment_taken_id: ``osid.id.Id``
        :param bank_id: the ``Id`` of the ``Bank``
        :type bank_id: ``osid.id.Id``
        :raise: ``NotFound`` -- ``assessment_taken_id`` or ``bank_id`` not found or ``assessment_taken_id`` not assigned to ``bank_id``
        :raise: ``NullArgument`` -- ``assessment_taken_id`` or ``bank_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure occurred

        *compliance: mandatory -- This method must be implemented.*