How to get all items from a looting category?

As the title say, how do i get all items in a category?
I want to count how many items i have from each category

Lets say you want all the items from category 'a', you do:

foreach lootingitem i 'a' do

    print(i.name, i.destination)

end

Now you want all the items from category 'a' and category 'b', you do:

foreach lootingitem i 'ab' do

    print(i.name, i.destination)

end

Easy, huh?

I'm not sure if that will count how many items of each catergory i have on my backpack

I tried something like

Code:

---

foreach lootingitem i 'sn' do
  if itemcount(i.name) > 0 then
        say('>')
    end
end

---

This works but count 1 by 1
Is there anyway to add it to a table and then count all items from that table?