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Use functions for every option of the menu and use a main function to store the rest of the code.

$$ Use a list of lists to store each student in the lineup.

$$ For the view and del commands, display an error message if the user enters an invalid student number.

$$ When you add or delete a student, the changes should be saved immediately. That way, no changes are lost.

$$ Make sure that the user$$s data entries are valid.