(a) the activities of the corporation for the particular year consist in any combination ofi. sawmill and wood preservation activities included in the group described under code 3211 of the North American Industry Classification System (NAICS) Canada, as amended from time to time and published by Statistics Canada,
ii. activities involved in the manufacturing of veneer, plywood and engineered wood products included in the group described under code 3212 of the North American Industry Classification System (NAICS) Canada, as amended from time to time and published by Statistics Canada, excluding activities involved in the manufacturing of structural wood products included in the class described under code 321215 of that publication, and
iii. activities relating to pulp, paper and paperboard mills included in the group described under code 3221 of the North American Industry Classification System (NAICS) Canada, as amended from time to time and published by Statistics Canada; and