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The document

The file is opened and rearranged in this tab. It is not uploaded.

How it should fold

A long document folded as one booklet has a spine hundreds of sheets thick and will not close. Signatures are how a real book is made: fold each one separately, then stack them.

What it works out to

Print it double-sided, flipping on the short edge. Flipping on the long edge turns every other sheet upside down, which is the other half of why this goes wrong.

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