The coloring red of two complete subgraphs of 
points (for even 
) in order to generate a blue-empty
graph.
Red Net
See also
Blue-Empty Graph, Complete GraphExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Red Net." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/RedNet.html