The Hilbert basis of the polyhedral cone of 8 x 8 Franklin squares is generated by the action of the group G on the three squares Tl, T2, and T3 in Figure 8 and their counterclockwise rotations through 90 degree angles. Not all squares generated by these operations are distinct. Let R denote the operation of rotating a square 90 degrees in the counterclockwise direction. Observe that R2 • Tl is the same as Tl and R3 ■ Tl coincides with R • Tl. Similarly, R1 • T2 is just T2, and R3 • T2 is the same as R • T2. Also Tl and R • Tl are invariant under the action of the group G. Therefore the Hilbert basis of the polyhedral cone of 8 x 8 Franklin squares consists of the following ninety-eight Franklin squares: Tl and R ■ Tl; the thirty-two squares generated by the action of G on T2 and R T2; the sixty-four squares generated by the action of G on T3 and its three rotations R • T3, R2 • T3, and R3 ■ T3.