stats
https://youtu.be/6YzrVUVO9M0?si=kLGyXQ-cDkGYuZt8
https://youtu.be/8idr1WZ1A7Q?si=Yj2jYUXoMlEbhraE

futher pure
https://youtu.be/3d6DsjIBzJ4?si=QI65huME9heAsY5C