Appendix: Orientation-free and Orientation sensitive (upright) Representations of Letters
![A-D](a-d.gif)
![E-J](e-j.gif)
![K-P](k-p.gif)
![Q-T](q-t.gif)
![U-X](u-x.gif)
![Y-Z](y-z.gif)
Levin, J. A. Network representation and rotation of letters. Department of Psychology,
University of California, San Diego, La Jolla CA 92037, September 12, 1973.