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<h4>combineNMergeTree</h4>
<pre class="methodSignature">public static&nbsp;<a href="../colgroup/AColGroup.html" title="class in org.apache.sysds.runtime.compress.colgroup">AColGroup</a>&nbsp;combineNMergeTree&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html?is-external=true" title="cl