Two rectangular framing outlines feature diagonal intersecting lines with multiple detail reference bubbles indicating connections to sheets SD.2, SD.3, and SD.8. Reference callouts 7D/SD.3 appear on the left and right sides of both rectangles. The upper rectangle includes callout 8B/SD.3 at the top. The lower rectangle includes callout 6B/SD.8 at the top and 18/SD.2 at the bottom. Alignment gridlines intersect the boundaries of both framing regions.
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