Let your spokes and rim tell you.
Thread a spoke and nipple through two adjacent holes. Holes are almost always drilled radially (except for side to side) so the spokes will want to go to and meet in the middle. Now pull down to add a bit of tension, and flex the ends apart to see where you begin to feel resistance because the nipples don't want to go further. That gap at the hub is what you don't want to pass on the build, so use whichever cross pattern is closest to it.
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