These two files are incorrectly classified as Perl. They should be
classified as Prolog. There are many distinctive tokens in each file
which clearly differentiate between Perl and Prolog.
This Prolog file was misclassified as Perl. I assume linguist
was confused because the file has many comments. Nevertheless,
there are plenty of Prolog-distinguishing tokens such as `:-`,
`module`, `%%`, capitalized variables names, `foo/2`, etc.