For my list, I chose to make a timetable code that has your subjects included.
The purpose of this code is to see what subjects are in your list and what aren't, which may be helpful when sorting out homework or assignments .
I used an "extend" method because we are adding all of the subjects to the list in one go, instead of adding one subject at a time.
The "if" and "else" statements were used to determine whether or not the subject was added into the list.
The function "CheckUser" basically checks if the user has inputted the subject or not.
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