This graph shows relationships between:

• athlete and sport events (edge is medals)
• country and athletes
• sport event and olympics games

Only athlete is unique. Country, sport event have affix of name Olympics games.
This is need in order to show: how to connected the athlete and the Olympic Games.
You can also see which countries participated in any games.
How many sports events were on the other, or the Olympics.
Also, through the athlete can understand how many medals were in the country.

Also have pdf version