I just posted this, which I think will answer your questions. Let me know if not.
https://www.lesswrong.com/posts/Z66PxZnZJNSXzf8TL/bottleneck-examples
I just posted this, which I think will answer your questions. Let me know if not.
https://www.lesswrong.com/posts/Z66PxZnZJNSXzf8TL/bottleneck-examples