Canon IR 2420 Printer Manual page 27

Rotate + Collate
This setting prints all pages of each copy (collating), and rotates every other
complete copy 90 degrees to indicate where each copy starts.
Offset + Group
This setting prints all copies of the same page before printing the next page. It
offsets every other complete set of pages to indicate where each new set starts.
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Offset + Collate
This setting prints all pages of each copy (collating), and offsets every other
complete copy to indicate where each copy starts.
Examples of each Finishing option when printing three copies of a three page
document:
Group Collate
Staple
Rotate + Group
Rotate + Collate
Offset + Group Offset + Collate
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