That's very good advice. Thank you. I've edited as suggested (removing contradictions, et cetera).

In my defense, the only reason (at least most of) the untagged code items were overlooked when I posted, rather than intentionally remaining untagged, is this: my reference to q as a function was due to misremembering it as being referred to as such by Schwartz and Christiansen in Learning Perl. I now realize they called it "notation" and that it was Castro's PERL and CGI for the World Wide Web that called q a function.

Again, great advice. Thank you.