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libestr is available under the terms of the GNU LGPL v2.1 or above (full
text below).
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                  GNU LESSER GENERAL PUBLIC LICENSE
                       Version 2.1, February 1999

Copyright (C) 1991, 1999 Free Software Foundation, Inc.
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liblognorm, a fast samples-based log normalization library
    Copyright (C) 2010 Rainer Gerhards

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