# Alphabets for character data

Characters for discrete data have values in an "alphabet". For example,
in the `DNA` alphabet, characters take on values `A`, `T`, `C`, or `G`.

BAli-Phy understand the following alphabets:

   `DNA`, `RNA`, `Amino-Acids`, `Numeric`, `Doublets`,
   `Triplets`, or `Codons`

The Doublets, Triplets, and Codons alphabets can take arguments to
specify the nucleotide alphabet or the genetic code.
