Outline
The US Code of Federal Regulations is written in outline format, but the structure of the outline is sometimes hard to decipher. Here is an index for your reference.
101.9
< >(a)
< >(b)
< >< >(1)
< >< >(2)
< >< >< >(i)
< >< >< >(ii)
< >< >< >< >(A)
< >< >< >< >(B)
Note that this usage is a little inconsistent. In some places the upper case letters are replaced by lower case italic letters (e.g. 101.100).
< >< >< >< >(a)
< >< >< >< >(b)