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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def if_sqlserver_disable_constraints_triggers(session: SqlASession, tablename: str) -> None: """ If we're running under SQL Server, disable triggers AND constraints for the specified table while the resource is held. Args: session: SQLAlchemy :class:`Session` tablename: table name """

    with if_sqlserver_disable_constraints(session, tablename):
        with if_sqlserver_disable_triggers(session, tablename):
            yield