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Choose one or the other but not both
I see your dilemma, which may be due to Australian usage which prefers the added "s" in the ratio of 10 to 1, according to the article you cite. However that same article (in the graphs) shows that dropping the "s" is clearly in the ascendancy in Britain, as it has been in the U. S. for some time. This suggests that dropping the "s" is more forward-looking, as it were, but in any event I would choose one or the other, and not use both.
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