It's not completely linear a bit, but not too hard at the same time. If you get 20 variables, that's probably too much to deal with. Then one is on diabetes. What about diabetes? Does that dataset represent? I'm actually not really sure what's the... It's a regression problem. And then another one is digits, which kind of meant to model images,. One of the early, I would say, breakthrough of machine learning was in the 90s.