Canon imageRUNNER C3220 Copying Manual page 157

G If the optional Saddle Finisher-N2 is attached:
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Press [Staple] © [Next].
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Select the stapling type ([Corner], [Double], or [Saddle Stitch]).
If you want to select [Corner] or [Double]:
Press [Corner] or [Double] © select the stapling position © press [OK].
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