Wait ONLY Covers do that?!
You wrote it ambiguously, you cant have a 90 turn and a 180 turn right after a left turn, did you mix up sentences or grammar or something?
Did you read my Code and just guessed what it did? because you clearly seem to see my array element swap Function in the Code and are wondering what the fuck it does.
I need to know what it does IN WORLD not what my own Code does. 
As for the whole Brick Issue, that is a really annoying one, and im not sure if I am able to fix that, but I might, maybe, unsure.