| activity_choice_message | Message for what activities they can choose |
| activity_path | Path to activities |
| bad_homework_message | Message a bad HW |
| crayon-pipe | Crayon operator |
| download_thing | Download a HW |
| launch_activity | Run activity based on given argument |
| open_thing | Open a HW |
| pipe | Pipe operator |
| update_materials | Update materials |
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