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The plural for thirteen is thirteens (13s).
As in "they are in their thirteens".
Boston Thirteens was created on 2009-02-13.
The plural is thirteens, but it is only used when referring to the number itself:
Addresses with two thirteens might seem unlucky. (1313)
We had to count to one hundred and thirty by thirteens.
Six thirteens as a decimal is approximately 0.461538461538.
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