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<b>let </b><font color="Maroon">Y</font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/>

<b>thus </b><span class="p1">(<span class="default"><a href="bvfunc_1.html#K16">O_el</a> <font color="Maroon">Y</font></span>)</span> <a href="bvfunc26.html#K4" target="_self">'nor'</a> <span class="p1">(<span class="default"><a href="bvfunc_1.html#K16">O_el</a> <font color="Maroon">Y</font></span>)</span> = 
 <a href="valuat_1.html#K5">'not'</a> <span class="p1">(<span class="default"><a href="bvfunc_1.html#K16">O_el</a> <font color="Maroon">Y</font></span>)</span>
<b>by </b><i/>
<br/>.= 
 <a href="bvfunc_1.html#K17">I_el</a> <font color="Maroon">Y</font>
<b>by </b><i><a class="ref" href="bvfunc_1.html#T5">BVFUNC_1:5</a></i>
;<br/>

<b>thus </b><a NAME="E2:32"/>
<span class="p1">(<span class="default"><a href="bvfunc_1.html#K16">O_el</a> <font color="Maroon">Y</font></span>)</span> <a href="bvfunc26.html#K4" target="_self">'nor'</a> <span class="p1">(<span class="default"><a href="bvfunc_1.html#K17">I_el</a> <font color="Maroon">Y</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="bvfunc_1.html#K16">O_el</a> <font color="Maroon">Y</font>
 <b>by </b><i/>;<br/>

<b>thus </b><a NAME="E3:32"/>
<span class="p1">(<span class="default"><a href="bvfunc_1.html#K17">I_el</a> <font color="Maroon">Y</font></span>)</span> <a href="bvfunc26.html#K4" target="_self">'nor'</a> <span class="p1">(<span class="default"><a href="bvfunc_1.html#K17">I_el</a> <font color="Maroon">Y</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="bvfunc_1.html#K16">O_el</a> <font color="Maroon">Y</font>
 <b>by </b><i/>;<br/>


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