.html#var-column-names">column-names</a> </li><li> <a href="tech.v3.dataset.html#var-columns">columns</a> </li><li> <a href="tech.v3.dataset.html#var-columns-with-missing-seq">columns-with-missing-seq</a> </li><li> <a href="tech.v3.dataset.html#var-columnwise-concat">columnwise-concat</a> </li><li> <a href="tech.v3.dataset.html#var-concat">concat</a> </li><li> <a href="tech.v3.dataset.html#var-concat-copying">concat-copying</a> </li><li> <a href="tech.v3.dataset.html#var-concat-inplace">concat-inplace</a> <