This refers to the five regions that the world is divided into—Africa, East Asia, Latin America and the Caribbean, Near East and South Asia, and the former Soviet Union and Eastern Europe—for the initial admission of refugees to the United States.
The legislature occasionally skips outline levels.
For example:
(3) A person may apply [...]
(4)(a) A person petitioning for relief [...]
In this example, (3), (4),
and (4)(a) are all outline levels, but
(4) was
omitted by its authors. It's only implied. This presents an
interesting challenge when laying out the text. We've
decided to display a blank section with this note, in order
to aide readability.