I always wished I could see into your mind, OP, and figure out your exact problem, and then just searh your $knowledge for the required backstory. But I can't, and you're going to have to use more general terms here so that programmers can understand. Assume we are the normal, entry-level class on your subject in a suburban high school. Assume we're just teenagers(which I in fact am, but I'm speaking metaphorically here), and know next to nothing about the subject. Assume you are the teacher, and someone has written "How do I post a question effectively?" on the blackboard.
Even simple, one-sentence explanations of a concept(as in, what does the data look like in some steps of the process?) can go a long way. I looked at the textbook-thing you linked to, but it's just words-words-words-sciencey-word-words-words-words to me. Maybe it's because I'm just a 15-year-old who is fascinated by his chemistry textbook. Who knows? I'm still a few years away from college.
As for your code, I think you need to choose better variable names. I have great difficulty reading code that just looks like random characters(people often ask me, "thomas, why do you use Perl?"). I hope this isn't supposed to end up as an obfuscation. You will eventually forget the meaning of those names, and then your code becomes a confusing mess.
Avoid "a" and "b" aa variable names unless that is in context with sort.
DEBUG() seems to be an empty subroutine. Is that what you intended?
P.S.: Ignore the first part if you want. I'm tired, which causes my writeups to become long and ramble-y. I'll probably remove it tomorrow, after thinking "why would I write that?"
confess( "I offer no guarantees on my code." );
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