Prime in name of mapTR' in solution but not in exercise task

[JanBeh]

In the exercise in part 1 on recursion and folds mapTR is written without prime, but in the solution mapTR' is written with prime.

I assume mapTR is meant to be mapTR' in both cases to avoid conflicts with mapTR from the prelude. The same may apply to filterTR, but I'm overall not sure if there is some consistency intended or if the reader is supposed to disambiguate themself.

Also note that mapMaybeTR (here in exercise) is disambiguated as mapMayTR. Perhaps some consistent naming/disambiguation scheme would be less confusing.