Thanks for the ideas, all. Sadly, most of those are already in the text (that's because they're common). Tilly and jepri have ideas that aren't in my book, though, so I'll see where I can work them in.

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Jeff[japhy]Pinyan: Perl, regex, and perl hacker.
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;