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A. An oblique bar stimulus, illustrating its symmetry across principal and secondary object axes. B. A stimulus that is asymmetric across both principal and secondary object axes. C. Left-right reflection (reflection across an extrinsic vertical axis) of the stimulus in (B) D. 90° counterclockwise picture-plane rotation of the stimulus in (B). E. Reflection of the stimulus in (B) across its principal axis.
