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I am not sure what exactly is the "idea" behind the 11.html. As, e.g., the case of "o'clock" shows (it works in 11.html and in o'.html) the rules are not so clear-cut. To my mind the rule should be: Put into 11.html all cases that otherwise would result in an invalid filename (on any? OS), period not being accepted as part of a filename proper. I did however not test whether the search engine finds for instance "3rd" in 3r.html.
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