automatic vertical rests centering in single-staff polyphony

[Alicuota618]

Hello,

I found long ago a way to center rests in single-staff polyphony. But
I dont find it anymore, neither in doc or google (or did I use wrong
words for searching).

To be more explicit, lilypond gives naturally the first rests of the
attachment (beat 2), and I try to obtain automatically the second rest
(beat 4).

Is there a way?

Thanks in advance,

Francois

ssRests.jpg
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