[ZOA NOM]

In order for all 5 teams to play each other once, it will require 10 games:

1 vs 2
1 vs 3
1 vs 4
1 vs 5
2 vs 3
2 vs 4
2 vs 5
3 vs 4
3 vs 5
4 vs 5

Do this twice for twenty games, each team gets a home game and an away game.

edit: dang! three minutes late!