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[Emma May Smith]

I don't think that f and p should be considered equivalent based on this evidence. They're certainly doing the same thing in the sequence, but not in the same place on the page. If there are four sequences then each sequence is a quadrant, and the occurrence of f or p must mark out each half or double quadrant.

The straight i variants of the characters which usually have e may also mark out the first sequence.

(I have more to say on this, but have to get my tea. I will comment again in an hour.)