Sequence diagram

[noradazaperez]

• Maybe you guys forgot to delete Mod from this sequence diagram.

• User doesn't have any activation bars either, and considering the rest do, maybe you should add them there.

• There are two users, but the one in the right looks like it should be the one on the left.

• Mode, TimetableManager, and Timetable should all have a column (:) before the name.