const EXERCISES: &str = "\
An exercise block on a page holds only the exercise id (exercise_id in reads). get_exercise reads the exercise: name, tasks, review settings and its instructions; patch_exercise edits the name, the own deadline, each task's instructions (/tasks/<task id>) and the review instructions (/review_instructions) with page-content ops. Everything else (points, tries, task specs, review thresholds and questions) is read-only; the teacher edits it in the editor.
- The effective deadline is the exercise's own, else its chapter's. Chapter deadlines are strongly preferred: own deadlines are easy to miss when dates change. Add one only when the teacher asks; deadline: null clears it. Times are RFC 3339 with an offset.
- /tasks/<task id>/specs reads a task's private, public and model solution specs together; the private spec is what the editor saves and the only authoritative one, and the service derives the others from it, so they can lag behind a staged change until publish. Specs hold answer keys: never copy them into what students see.
- Instructions take the blocks the editor allows there, which the validator checks; exercise blocks can't be nested in them.
- Review instructions show only for exercises with peer or self reviews. Most exercises use the course default review config, so its instructions are shared: review_config edit_course_default edits them for every exercise using it. Prefer that. fork gives one exercise its own copy of the default settings and questions, for an exercise with special needs; use_course_default drops an exercise's own settings again, and the result lists what it drops.
- Switching review settings is allowed after students have given reviews, but the result and the review page warn about it.
- Name and instruction edits are never risky; a deadline change is risky as in publishing-and-risk.
- find_replace and structural_replace include instructions by default (include_exercise_instructions) and find_replace exercise names with include_exercise_names; matches in the course default review instructions are listed once and change every exercise using it. Bulk tools never fork. Regexes (find_replace regex: true, structural_replace text_regex) use Rust regex syntax: no backreferences or lookaround; (?i) for case-insensitive.";