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<div><span class="kw">theorem </span><a NAME="T2"><span class="comment"><font color="firebrick">:: CARD_4:2</font></span><br/></a><div class="add"> <a href="ordinal1.html#K4" title="ORDINAL1:func.4">omega</a>  is  <a href="card_3.html#V4" title="CARD_3:attr.4">countable</a>  ;<br/></div></div>
