Thank you for the question.
In the agreement there is a provision. In the 2006 Canada-U.S. Softwood Lumber Agreement the United States agreed to lift the duties they were charging in previous years and to refund to Canadian exporters about $5 billion in charges that they had collected. In return, Canada agreed to implement a system of export measures. In some regions the export measures are a charge and an export quota, or restriction on exports, and in other regions the measure is an export charge with a surge trigger. The surge trigger applies to what we call option A regions. It's British Columbia coast, British Columbia interior, and Alberta. According to the agreement, exports from these provinces or regions can go to a certain level. If they pass a certain volume level, there's a surge charge, which is an additional 50% charge on exports from that region.
The provision is there to ensure that if any of the option B regions in the future ever decided to choose the option A, any surge charge that was collected would not be subject to the additional charge. It's careful drafting on that point, because in fact the option B regions that are affected by this charge are not subject to this surge charge provision.