It appears the `hints.md` files for the concept exercises are just blank stubs. This includes the four current exercises: - [x] [`annalyns-infiltration`](https://github.com/exercism/r/tree/main/exercises/concept/annalyns-infiltration) - [ ] [`cars-assemble`](https://github.com/exercism/r/tree/main/exercises/concept/cars-assemble) - [ ] [`elyses-enchantments`](https://github.com/exercism/r/tree/main/exercises/concept/elyses-enchantments) - [x] [`lasagna`](https://github.com/exercism/r/tree/main/exercises/concept/lasagna)