Index - R
| reachable | Data.Graph | 
| replicate | Data.Sequence | 
| replicateA | Data.Sequence | 
| replicateM | Data.Sequence | 
| restrictKeys | |
| 1 (Function) | Data.Map.Strict, Data.Map.Lazy, Data.Map | 
| 2 (Function) | Data.IntMap.Strict, Data.IntMap.Lazy, Data.IntMap | 
| reverse | Data.Sequence | 
| rootLabel | Data.Tree | 
| runWhenMatched | Data.Map.Lazy.Merge, Data.Map.Strict.Merge | 
| runWhenMissing | Data.Map.Lazy.Merge, Data.Map.Strict.Merge |