The normal rate of contribution established for age 40 is the rate for any member who has attained a greater age before entrance into the system, and that established for age 21 is the rate for any member who enters the system at a lesser age.
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.