on the same gui answer me on these questions also: $3.$ Furthermore, you program should allow at most $6$ courses to select.

$4.$ Also, if you choose two courses in same time $($As an example, if you choose courses

in figure $3$ and if you want to add course in figure $3,$ it should give warning$),$ your

program should warn the user like in figure $3$ and not add the last item to the

timetable

$5.$ Your timetable should not refresh when you change year or code while searching

courses. As an example, you take $3$ courses from CS department and if you want to

take some common courses, when you go search common courses, your program

should keep $3$ CS courses not remove from the timetable. You should put a clear

button in order to create new timetable. Finally, when you create your timetable,

click on save button and get all courses from your timetable and write them to the

$$timetable$.$csv$$ file.