Each Roman numeraled item may be subdivided into two or more (A, B, etc.) major parts (approximately equal in importance) to further clarify or explain the scope of that major item.

The Tarim mummies, found in present-day China, were anhydrated naturally by searing desert conditions.

I only came over here to see that darned false alarm of a play of mine put on.

In British Columbia, where an employee requests it in writing, and employer may establish a time bank for the employee and credit overtime wages to the time bank instead of paying them to the employee.