I'm not a big fan of it personally and I think many stray too far on their naming conventions but no official ruling has ever been laid down. Use your judgement in this instance and perhaps something a bit more official (hopefully not  ) will appear eventually.
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“I wish it need not have happened in my time," said Frodo.
"So do I," said Gandalf, "and so do all who live to see such times. But that is not for them to decide. All we have to decide is what to do with the time that is given us.”
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