When I input "tt/ del/ day/2 time/1" to delete the first class added, all classes will be deleted from the timetable.txt file.  First class added is "tt/ add/ day/2 code/22 time/1 duration/2 location/ home" <!--session: 1712306667157-fa178a2e-eea3-4c05-b4be-dd73a4ae46b5--> <!--Version: Desktop v3.5.3-->
When I input "tt/ del/ day/2 time/1" to delete the first class added, all classes will be deleted from the timetable.txt file.
First class added is "tt/ add/ day/2 code/22 time/1 duration/2 location/ home"