f17r multispectral images

[oshfdk]

F66 is grammatically and meaningfully correct. The context refers to the drawing and describes what is to be done.

But it's just 4 words of 1, 3, 3, 3 letters, some of the letter shapes look a bit strange and one of the words heavily redacted. Also, they are not positioned on a single line, so, potentially you can read them in many different orders, top-bottom left-right, circular clockwise, etc. I won't be surprised if one can find several good readings in this situation. The same can be said about the drawing, one can easily interpret it in many ways.