How to write a segno and coda code together?

[Michel Berteaud]

Hello! I use lilypond for some weeks now with Windows and it works well.
I have a little problem concerning how to write a segno sign and a coda sign
both centered on a bar. I tried to put the code of each one at the same place,
but it didn't work. It displaid one of the two, but not both. Could you, please,
tell me how to write it in my source code?
Thank you.