If you are copying from the scanner glass, Duplex (2-sided) copying, Duplex copy (long edge) – Brother DCP-9045CDN User Manual
Page 48: 2 in 1 (l), 4 in 1 (p), 4 in 1 (l), 1 sided i 2 sided portrait, Landscape, 2 sided i 2 sided portrait
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