The only rule is that numbers inserted must be along the vertical and horizontal axis, not diagonal.

All of them contain four diagonal 3-fold axes.

This particularity shifts the center of gravity of the building, giving the it an ascending diagonal axis.

A row of the walls, a colonnade of cylinders of decreasing size, form a strong, diagonal axis that cuts straight through to the back.

Example B also has reflections across a vertical axis, and across two diagonal axes.

It only has reflections in horizontal and vertical directions, not across diagonal axes.

Each diagonal axis contains "natural" political allies.

Bramante had envisioned that the central dome be surrounded by four lower domes at the diagonal axes.

The is oriented on a diagonal axis with respect to the street corner.

Sumatra is an elongated landmass spanning a diagonal northwest-southeast axis.