== This is a "Chapter" Heading in some contexts

Content.

=== This Is a Top-Level Heading (A-Head)

Content.

==== This Is a Second-Level Heading (B-Head)

Content.

===== This Is a Third-Level Heading (C-Head)

Content.

=== This is a Top-Level Heading, and Should Not be Included in the Third-Level Heading

Content.