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<b>let </b><font color="Maroon">F</font> be   <a href="card_3.html#NM1">Cardinal-Function</a>;<br/>

<a NAME="E1:51"/>
 <a href="card_3.html#K1" target="_self">Card</a> <font color="Maroon">F</font> <a href="hidden.html#R1">=</a> <font color="Maroon">F</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:51"/>
 <a href="card_1.html#K1">Card</a> <span class="p1">(<span class="default"><a href="card_3.html#K3" target="_self">Union</a> <font color="Maroon">F</font></span>)</span> <a href="card_1.html#NR1" target="_self">&lt;=`</a>  <a href="card_3.html#K6" target="_self">Sum</a> <font color="Maroon">F</font>
 <b>by </b><i/>;<br/>


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