The other replies are correct, but why do you care? The trick is what's counter-intuitive about this. If you work in a widget factory and are trying to figure

The other replies are correct, but why do you care? The trick is what's counter-intuitive about this. If you work in a widget factory and are trying to figure out why widgets go bad, you might sort your widgets by size and color. If sorting by that doesn't seem to help you find a pattern in the bad widgets, you might add more data - whether the widgets are right or left handed, metric or English units, or something. The problem with this is that by adding more data you're actually making your problem harder since you've added an extra dimension, which as other commentors described will blow up your search space pretty quickly. The extra data will be the most help if it allows you to ignore the previous data. The more dimensions you add, the less likely it is the next dimension makes things simpler rather than just more complicated. One more reason to keep things simple.