Meh, sorry, didn't understand at all!

I see what you're saying now.. I was misled by this comment in the file:

"// Shift switches between current level and level+1"

thinking "oh, well I should be able to get 4th character.."

I've really been puzzled about this for over a month, so although it's disappointing not to be able to further map the kb, it's very satisfying to finally know what's going on.. Thanks!