<span id="result_box" class="" lang="en"><span class="hps">Hi, <br>Are there any problems</span> <span class="hps">if I delete</span> <span class="hps">columns and then</span> <span class="hps">do&nbsp;</span><span class="hps">solve</span><span class=""> (primal() or dual())?<br><br>Thanks.<br></span></span>