and by the way - thank you very much for your comments, you really help, I will try to take into account all these points, it is impossible to take everything into account at once, this is a human factor, in general I thought to expand the functionality a little, but you showed me the problems that need to be (and can be) solved. nevertheless, if you have a solution to the problems, you know my email, I will be very grateful. although you have already saved me a lot of time without this. thank you