| cardinalNeighbs | AOC.Common, AOC.Prelude |
| catchError | AOC.Prelude |
| catMaybes | AOC.Prelude |
| catMaybesOf | AOC.Prelude |
| CD | AOC.Run.Load, AOC |
| centralize | AOC.Challenge.Day10, AOC.Challenge, AOC |
| Cfg | AOC.Run.Config, AOC |
| ChallengeData | AOC.Run.Load, AOC |
| challengeData | AOC.Run.Load, AOC |
| ChallengeMap | AOC.Discover, AOC.Challenge, AOC |
| challengeMap | AOC.Challenge, AOC |
| ChallengePaths | AOC.Run.Load, AOC |
| challengePaths | AOC.Run.Load, AOC |
| ChallengeSpec | AOC.Discover, AOC.Challenge, AOC |
| Char | AOC.Prelude |
| charPart | AOC.Discover, AOC.Challenge, AOC.Run.Load, AOC |
| chr | AOC.Prelude |
| clearOut | AOC.Common, AOC.Prelude |
| cloneFilter | AOC.Prelude |
| ClosePunctuation | AOC.Prelude |
| compare | AOC.Prelude |
| comparing | AOC.Prelude |
| concat | AOC.Prelude |
| concatMap | AOC.Prelude |
| Config | AOC.Run.Config, AOC |
| configFile | AOC.Run.Config, AOC |
| ConnectorPunctuation | AOC.Prelude |
| Const | |
| 1 (Data Constructor) | AOC.Prelude |
| 2 (Type/Class) | AOC.Prelude |
| const | AOC.Prelude |
| Constraint | AOC.Prelude |
| Control | AOC.Prelude |
| countdownConsole | AOC.Run.Load, AOC |
| CP | AOC.Run.Load, AOC |
| CS | AOC.Discover, AOC.Challenge, AOC |
| CurrencySymbol | AOC.Prelude |
| currPeepPos | AOC.Common.Elfcode |
| curry | AOC.Prelude |
| cycle | AOC.Prelude |
| cycle1 | AOC.Prelude |