https://olwooz.github.io/hku-timetable-combination-finder/
3. Click "See Combinations" to see all possible combinations (icon on the right -> view as a "real" timetable)
- which day you want off
- when the earliest lecture start time is (eww... morning lectures)
- how many courses you are taking (i.e. you can select 7 courses and see combinations for 5 courses out of 7)