Folio numbers

[ChenZheChina]

This seems to be an example of a fold that could go both ways:

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Thanks. I see the folding between f101r1 and f101r2 seems to go both ways.

This is very interesting.

It seems that all foldings are folded toward the center of the quire at first folding. Outer foldings may be folded toward or away from the center, though.

Like this: