Butt another board into the corner against the wall, tracing its edge where it overlaps the board that is temporary taped to the wall. You will want to cut this plank so that the raw edge will butt against the corner. If any routing or design on your planks makes a left side versus a right side, you may need to turn the plank upside down (end-to-end) so that you mark the correct edge for cutting. You will flip it back when you attach it in the next step. Remove both planks.
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