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Mid-ride on the Duty Line, Pruett turns out to also analyze constructive notice — station N2’s question, on a line you haven’t boarded. The method’s move?
On this map the Notice Line and the Duty Line leave the first station on the same rails and only split after the duty station. What does the shared trunk represent?
The finished intersection chart shows Pruett’s column holding teal cells (D1, D2) and a red cell (N2). What is that column telling you?