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<p>
Returns the set of of the key values in the <a class="el" href="classlog4cxx_1_1_m_d_c.html">MDC</a> for the event. 
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The returned set is unmodifiable by the caller.<p>
<dl compact><dt><b>Returns:</b></dt><dd>Set an unmodifiable set of the <a class="el" href="classlog4cxx_1_1_m_d_c.html">MDC</a> keys. </dd></dl>
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