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How to delete accounts on Stack Exchange?

I have been told that I have too many accounts on Stack Exchange. And he is right. Some are totally useless. Now I would like to delete those accounts. I have found the following advice:

How can I delete my account?

Alas, this recipe does not work for me. Moreover I cannot post there because ... guess what ... I have no account there! Moreover, what is annoying, there seem to be other questions on the same issue, but they are all routed to the above one.

Can someone please explain me how I can delete some accounts?