Here’s a way to visualize this. Write down a horizontal list of all the things. Write down a vertical list of all the things. Now draw columns and rows so you have a table of all the things with all the things. Now colour a square white if two things are connected, and colour a square black if two things aren’t connected. So if all the things are connected, then you have a white canvas. And if all the things are unconnected, you have a black canvas.
Wouldn’t it make more sense to use a grey scale? :-)
Wouldn’t it make more sense to use a grey scale? :-)