Canon IR3320i Copying Manual page 157

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You can reduce the output of pages without images (blank output) by setting the layout of the last original.
2
To make a two-sided copy, press [2-Sided Copy].
After pressing [2-Sided Copy], select the type of two-sided orientation, and press [OK].
Dividing an Original Into Equal Sections and Enlarging Each Section on a Separate Copy Sheet (Image 2-47
Separation)