Visualization of tag implications.
So, I tried to do it more neat, but advanced procedures is taking too much time, and then crash, so, I used only quicker things. Arrows pointing according with implications.
As you can see, most “arrow spam” is going from all the shippings, with “shipping” tag adding even more lines. So, I removed “shipping” tag (but not shippings themselves) and some other accompanying tags. There is result, it’s somewhat less clustered:
Source for graphviz, if you want to play with it:
http://pastebin.com/mpDMRk9m