This shows two circles, which are the same size. The 1^{st} is divided into 12 equally sized segments. The 2^{nd} is divided into 12 equally divided segments as well but the 1^{st} segment has been divided into two, to create two half segments. The segments are numbered from 1 to 13.

Under the circles the segments are shown fitted together to form a rectangular like shape. The two half segments form the ends of the rectangle and circular edges of the segments the top and bottom of the rectangle. Next to this a rectangle has been drawn around this same shape formed by the segments. Each segment again is numbered from 1 to 13.