Observe the above figure carefully. The two types of circles in this figure represent two types of constituent particles of a solid.

Will you call the arrangement of particles in this solid regular or irregular?

 

Observe the above figure carefully. The two types of circles in this figure represent two types of constituent particles of a solid.

Is the arrangement of constituent particles same or different in directions $\overrightarrow{\mathrm{AB}},\overrightarrow{\mathrm{CD}}$, and $\overrightarrow{\mathrm{EF}}$ ?