Protest and Request For Further Review No. 0201-90-000383; Grindstones of natural stone; grindstones of agglomerated abrasives; subheadings 6804.22.10 and 6804.23.00; explanatory notes to heading 6804; resins; synthetic binders; U.S.-Canada Free Trade Agreement; General Note 3(c)(vii)(B)(1) and (2); General Note 3(c)(vii)(R)(13)(aa)