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<b>let </b><font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">F</font> be   <a href="funct_1.html#NM1">Function</a>;<br/>



<a NAME="E1:5"/>
<font color="Maroon">F</font> <a href="funcop_1.html#K5">[;]</a> <font color="Maroon">x</font>,<a href="xboole_0.html#K1">{}</a>  <a href="hidden.html#R1">=</a> <font color="Maroon">F</font> <a href="funcop_1.html#K3">.:</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="relat_1.html#K1">dom</a> <a href="xboole_0.html#K1">{}</a> </span>)</span> <a href="funcop_1.html#K2">--&gt;</a> <font color="Maroon">x</font></span>)</span>,<a href="xboole_0.html#K1">{}</a> 
 
;<br/>
<b>hence </b><a NAME="E2:5"/>
<font color="Maroon">F</font> <a href="funcop_1.html#K5">[;]</a> <font color="Maroon">x</font>,<a href="xboole_0.html#K1">{}</a>  <a href="hidden.html#R1">=</a>  <a href="xboole_0.html#K1">{}</a> 
 <b>by </b><i/>;<br/>


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