I don't mean to steal Baker's thunder on this, but I have a couple of drawings from last year.
This, if I've read correctly, is what Baker describes, which is exactly how you'd wire it in 3C + E / w/ a strapper -
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This is an alternative method, which actually uses one less conductor, and seemed the most practical way when wiring 2 way lighting with singles. The connections to L1 and L2 need to be reversed so that both rocker switches are upright in the 'off' position. If that makes sense -
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