It's a break point label, to allow you to break out of a specified loop, rather than simply the innermost one you happen to be in.
It's used on line 148.
3 of 3
[(its = possessive, it's = "it is" or "it has". See for example <http://www.wikihow.com/Use-Its-and-It%27s>.)]
Peter Mortensen
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pauljwilliams
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