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29.
A circular diagram divided by a horizontal diameter. The upper semi-circle contains several radii converging at the center point. The lower semi-circle contains a series of intersecting diagonal lines forming a lattice-like pattern.
30.
A circular diagram with a central point. Several radii extend from the center to the upper circumference. In the lower half, lines descend at various oblique angles from the horizontal diameter, not meeting at a single point.