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Petroglyph

21 black line segments of varying lengths; 21 small gray circles and 21 curving gray arrows of varying lengths. At the bottom are 7 repeats, in a horizontal row, of the following pattern: a small gray circle, a thick black horizontal line segment, and a gray arrow below the line segment that starts out pointing to the right, then curves upward so that its arrowhead points to the middle of the line segment.