-- | The stag hunt. Similar to the prisoner's dilemma except mutual
--   cooperation is both a Nash equilibrium and Pareto optimal, and is
--   therefore stable.
stag :: Dilemma
stag = symmetric [C,D] [3,0,2,1]
stag :: Dilemma
stag = symmetric [C,D] [3,0,2,1]
stag = symmetric [C,D] [3,0,2,1]