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The example in S05 under "Subpattern numbering" isn't quite complex enough to give the reader a full understanding of the ramifications of the re-numbering that occurs with alternations, especially with respect to the combination of capturing and non-capturing subpatterns. I've written a small example and explanation to address this (attached as diff) based on an IRC conversation with fglock. If it's deemed correct, could this be included, please?