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<div><span class="kw">theorem </span><a NAME="T80"><span class="comment"><font color="firebrick">:: QUATERN3:80</font></span><br/></a><div class="add"><a href="quatern2.html#K2" title="QUATERN2:func.2">1q</a> <a href="quatern3.html#K2" title="QUATERN3:func.2">^2</a>  <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> 1</div></div>
