someone on gamefaqs said he found a website explaining it, he did not post the link(he said he can't) but he did put the info onto the discussion, the LNA part are split into 2 part the first 2 letter is the product type, (LN-cartridge|TS-game box|MA-instruction manuals|FA-leaflets|MK-quick start guides) the last letter means retail-A and demo-z
That makes sense.
But i don't understand what the 4 letters are before the region shortcut.