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You have wrong teachers in the constraints teacher max real days per week.

Yes, sure, I understood that.

So you want to remove more teachers with a single click? I'll add this in the TODO.

Unfortunately, it is difficult. You need to increase the IDs of the activities in the second file and also update these IDs in all the constraints in the second file.

You can attach here.

Thank you, Thai Chi!

These new constraints are probably useful for many other users, not only in Vietnam. You both had great suggestions!

I apologize for keeping things changing, but it is so hard to find the best code.

I added a new snapshot, with minor improvements. If you can, please test.

Yes, I made some improvements and just put a new snapshot. Please test a bit the new constraints, again.

I added a new snapshot, with critical possible crash bugs fixed. Same link.

I am also thinking of speed improvements, I may put a new snapshot soon.

I hope the new constraint, suggested by Thai Chi Phuong and Vũ Ngọc Thành, max 1/2 activity tags per day/real day for teacher(s)/students (set) will be important for many other uses. I am happy with it.

Hello, Thai Chi,

Thank you!

I added a new snapshot, as explained in the Snapshots section. Same download link. Please use it instead.

I hope to release the new official version maybe on Sunday afternoon.

I just added a new snapshot, some nonessential bugs fixed (if the old file had constraints N1, N2, N3 and there were not such activity tags, FET crashed when generating. Now it reports the error).

Same download link.

I it ready. Please see the Snapshots announcement or get it from: https://lalescu.ro/liviu/fet/download/test/

Please let me know.

I have put a new snapshot. From the ChangeLog:

  - Added the constraints teacher(s)/students (set) max activity tags from a set per day/real day (suggested by Thai Chi Phuong and Vũ Ngọc Thành). This constraint accepts as a maximum number of tags 1 or 2, and incorporates the old-style constrains teacher(s)/students (set) max two activity tags per day/real day from N1, N2, N3.
  - Added the constraints teacher(s) no two consecutive days (suggested by Khelifi Fouad Mohssen).

The new constraint referring to maximum tags per day might be a constraint useful for more purposes.

The link, as usual: https://lalescu.ro/liviu/fet/download/test/

Thank you! You too had a good suggestion!