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@uref{http://www.gnu.org/licenses/lgpl-2.1.html, LGPL 2.1},
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including an "or any later version" clause, or, if you prefer
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a gift-style license, the
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@uref{http://mit-license.org/, MIT} license.
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@uref{http://www.gnu.org/licenses/gpl-2.0.html, GPL 2} including
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an "or any later version" clause is also acceptable, but LGPL is