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<b>let </b><font color="Maroon">N</font> be   <a href="e_siec.html#NM2">e_net</a>;<br/>

<a NAME="E1:20"/>
( the <a href="e_siec.html#U1" target="_self">entrance</a> of <font color="Maroon">N</font> <a href="relat_1.html#K5">*</a> the <a href="e_siec.html#U2" target="_self">escape</a> of <font color="Maroon">N</font> <a href="hidden.html#R1">=</a> the <a href="e_siec.html#U1" target="_self">entrance</a> of <font color="Maroon">N</font> &amp; the <a href="e_siec.html#U2" target="_self">escape</a> of <font color="Maroon">N</font> <a href="relat_1.html#K5">*</a> <span class="p1">(<span class="default">the <a href="e_siec.html#U2" target="_self">escape</a> of <font color="Maroon">N</font> <a href="xboole_0.html#K4">\</a> <span class="p2">(<span class="default"><a href="relat_1.html#K6">id</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">N</font></span>)</span></span>)</span> <a href="hidden.html#R1">=</a>  <a href="xboole_0.html#K1">{}</a>  &amp; the <a href="e_siec.html#U2" target="_self">escape</a> of <font color="Maroon">N</font> <a href="relat_1.html#K5">*</a> the <a href="e_siec.html#U1" target="_self">entrance</a> of <font color="Maroon">N</font> <a href="hidden.html#R1">=</a> the <a href="e_siec.html#U2" target="_self">escape</a> of <font color="Maroon">N</font> &amp; the <a href="e_siec.html#U1" target="_self">entrance</a> of <font color="Maroon">N</font> <a href="relat_1.html#K5">*</a> <span class="p1">(<span class="default">the <a href="e_siec.html#U1" target="_self">entrance</a> of <font color="Maroon">N</font> <a href="xboole_0.html#K4">\</a> <span class="p2">(<span class="default"><a href="relat_1.html#K6">id</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">N</font></span>)</span></span>)</span> <a href="hidden.html#R1">=</a>  <a href="xboole_0.html#K1">{}</a>  )
 
<b>by </b><i>, </i>;<br/>
<a NAME="E2:20"/><b>then </b>
( the <a href="e_siec.html#U1" target="_self">entrance</a> of <font color="Maroon">N</font> <a href="relat_1.html#K5">*</a> the <a href="e_siec.html#U2" target="_self">escape</a> of <font color="Maroon">N</font> <a href="hidden.html#R1">=</a> the <a href="e_siec.html#U1" target="_self">entrance</a> of <font color="Maroon">N</font> &amp; the <a href="e_siec.html#U2" target="_self">escape</a> of <font color="Maroon">N</font> <a href="relat_1.html#K5">*</a> <span class="p1">(<span class="default">the <a href="e_siec.html#U2" target="_self">escape</a> of <font color="Maroon">N</font> <a href="xboole_0.html#K4">\</a> <span class="p2">(<span class="default"><a href="relat_1.html#K6">id</a> <span class="p3">(<span class="default"><a href="relat_1.html#K1">dom</a> the <a href="e_siec.html#U2" target="_self">escape</a> of <font color="Maroon">N</font></span>)</span></span>)</span></span>)</span> <a href="hidden.html#R1">=</a>  <a href="xboole_0.html#K1">{}</a>  &amp; the <a href="e_siec.html#U2" target="_self">escape</a> of <font color="Maroon">N</font> <a href="relat_1.html#K5">*</a> the <a href="e_siec.html#U1" target="_self">entrance</a> of <font color="Maroon">N</font> <a href="hidden.html#R1">=</a> the <a href="e_siec.html#U2" target="_self">escape</a> of <font color="Maroon">N</font> &amp; the <a href="e_siec.html#U1" target="_self">entrance</a> of <font color="Maroon">N</font> <a href="relat_1.html#K5">*</a> <span class="p1">(<span class="default">the <a href="e_siec.html#U1" target="_self">entrance</a> of <font color="Maroon">N</font> <a href="xboole_0.html#K4">\</a> <span class="p2">(<span class="default"><a href="relat_1.html#K6">id</a> <span class="p3">(<span class="default"><a href="relat_1.html#K1">dom</a> the <a href="e_siec.html#U1" target="_self">entrance</a> of <font color="Maroon">N</font></span>)</span></span>)</span></span>)</span> <a href="hidden.html#R1">=</a>  <a href="xboole_0.html#K1">{}</a>  )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:20"/>
 <a href="sysrel.html#K1">CL</a> the <a href="e_siec.html#U1" target="_self">entrance</a> of <font color="Maroon">N</font> <a href="hidden.html#R1">=</a>  <a href="sysrel.html#K1">CL</a> the <a href="e_siec.html#U2" target="_self">escape</a> of <font color="Maroon">N</font>
 <b>by </b><i><a class="ref" href="sysrel.html#T59">SYSREL:59</a></i>;<br/>


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