Collaborations

With five, exactly with five, six publications a year, that's what I still can't understand. Like do you have a bunch of collaborators that you're really close with? Or is it like new every time? So for example, there are some collaborations which are going on for, I don't know, almost 15 years. That's a long time. And another question I could have is, what do the collaborators collaborate on multiple projects with you?