I posted this on another site. Rather than showing you a nano, I'll show you how to set up one, so you can make your own...
The key behind a nano is
blitzing two defenders to take out two linemen who are side by side,
then sending someone through the gap of the two linemen. You can then
add 1 or 2 more blitzers to take the linemen on the otherside that will come around and try to block the nano.
There's a lot more to it but that's pretty much the basics.