How to read marginalia on f28v?

[oshfdk]

My carelessness again...

It's perfectly fine to not know that something was discussed before, and it's quite often hard to find things. It's just assuming that little attention has been paid to something related to the manuscript is usually wrong. Almost every piece and trace has been poured over many times. The only exception could be some details visible in the multispectral images, these have been only available for a couple of years, so sometimes something new is discovered there.