Assorted machinery having to do with just the bird code
system is relegated to a separate module,
The module contains an assortment of manifest constants and functions, and one class.
Maximum length of a bird code, 6 in the CBC system.
A string containing
A regular expression (using Python's standard
re regular expression
module) that describes a valid bird code.
The relationship code for simple (non-compound) forms, one space.
The single-character relationship code denoting
The single-character relationship code denoting a