Polski: A simple graph to illustrate the Friendship Paradox (average neighbor having more connections), color-blind friendly palette, can be reproduced with DOT language code:

graph friendship_paradox {
 ratio=1
 splines=line
 node [style=filled]
 A [fillcolor=pink]
 B [fillcolor=lightblue]
 C [fillcolor=lawngreen]
 D [fillcolor=orchid]
 A -- B -- D
 A -- C -- B
}