ethod for class 'MDB'</span></span>
<span><span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="va">...</span><span class="op">)</span></span>
<span></span>
<span><span class="co"># S3 method for class 'MDB'</span></span>
<span><span class="fu"><a href="https://rdrr.io/r/base/merge.html" class="external-link">merge</a></span><span class="op">(</span></span>
<span>  <span class="va">x</span>,</span>
<span>  <span class="va">y</span>,<