This article was recently published in the current Datafile issue, V26N5,
but most regrettably the printed version contains a show-stopper
error in the listing, which of course wasn't present in the original
Word document I submitted.
I discovered the error as part of my protocol of proofreading and checking my articles in the actual, paper-printed issue, as soon as I received it (two days ago). I also do the same with the actual Word document I submit for publication, which I first print and then proofread, including keying in the programs from the printed listing and trying out every example. This guarantees that the programs and examples will be keyable and will run as printed.
Unfortunately, while the Word document I submitted was indeed error-free, the article as it appears in Datafile is not and will result in a SYNTAX ERROR when you try to run it, so I've uploaded the correct, original article to my web site to try and help remedy the situation.
Please download the correct, original article from my web site and though it's none of my fault I nevertheless wish to apologize for any inconvenience, which I deeply regret.