Copyright 2001 Gareth Rees.  All rights reserved.
Copyright 2004-2011 Ned Batchelder.  All rights reserved.

Redistribution and use in source and binary forms, with or without
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1. Redistributions of source code must retain the above copyright
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
DAMAGE.