Class a includes:
Agriculture, forestry, animal husbandry and fishing?
Food?
Sugar, cigarettes, wine, vinegar?
Clothing, shoes and hats?
Daily necessities and furniture?
Health care?
Life saving and fire fighting?
Sports, entertainment
Class e includes:
Roads and bridges?
Civil engineering?
Water supply and drainage?
Architecture?
Lock, hinge?
Doors and windows, ladders?
Drilling and mining?
Water and sewage treatment