Yb

In "Yb," the words "spot," "studio" and "two-legged" are visible and self-explanatory on the top corners of the index pages.

But the limits of the height of Yb may be thus generally stated.

But "Yb" will send the average viewer to the dictionary: It's the symbol for the chemical element ytterbium.

I have also supposed Yb, when expanded from beneath Xb, as always expanded into a square, and four spurs only to be added at the angles.

Under such circumstances, it is well to exhibit the lower tiers of the foundation as well as Yb and Xb.