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Under Range and Copies, choose Pages.
Type the numbers of the pages in this order (n is the total number of
pages, and a multiple of 4):
n, 1, 2, n-1, n-2, 3, 4, n-3, n-4, 5, 6, n-5, n-6, 7, 8, n-7, n-8, 9,
10, n-9, n-10, 11, 12, n-11…
…until you have typed all of the pages.
Examples:
4 page booklet: Type 4,1,2,3
8 page booklet: Type 8,1,2,7,6,3,4,5
12 page booklet: Type 12,1,2,11,10,3,4,9,8,5,6,7
16 page booklet: Type 16,1,2,15,14,3,4,13,12,5,6,11,10,7,8,9
20 page booklet: Type 20,1,2,19,18,3,4,17,16,5,6,15,14,7,8,13,12,9,10,11