top right corner of f1r, possible inscriptions

[oshfdk]

This is not the end of my investigation for the AR pattern, I will further refine the search using other clearly visible shapes. But as I see it, there is really something resembling an AR-like shape on the page, but either it was a single shape created in some way, or this is just a combination of different features on the page that together resemble an AR shape. It's also important to consider what other elements on the page are enhanced by the same linear transformation of color channels, this might give some clues as to what a shape is made of.