There shouldn't be periods here, and the sentences down on lines 228 and 231 shouldn't be capitalized. You used to end up with sentences like "So in this case for every 2 positions you move down (because it's negative) you must also move 3 positions to the right." but now there's a period and a capital, and you get "So in this case for every 2 positions you move down (because it's negative) . You must also move 3 positions to the right." There's also an extra space in there.