Hi, I'm new to Haskell and am getting this error: AlphaBeta.hs:1: Ambiguous type variable `v' in the top-level constraint: `Ord v' arising from use of `maxValue' at AlphaBeta.hs:12 in the following code: module AlphaBeta where -- Game states are instances of MinimaxState class MinimaxState st where successors:: st -> [(action,st)] terminal:: st -> Bool utility:: (Ord v) => st -> v minimaxDecision state = filter (\(_,st) -> utility st == v) (successors state) where v = maxValue state maxValue:: (MinimaxState state, Ord v) => state -> v maxValue state = if terminal state then utility state else (foldl max x xs) where (x:xs) = map (minValue.snd) (successors state) minValue:: (MinimaxState state, Ord v) => state -> v minValue state = if terminal state then utility state else (foldl min x xs) where (x:xs) = map (maxValue.snd) (successors state) Any hints would be appreciated. -Arjun