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<b>let </b><font color="Maroon">S</font> be  non <a href="struct_0.html#V3">empty</a>  <a href="yellow_0.html#M1">SubRelStr</a> of <font color="Maroon">T</font>;<br/><b>let </b><font color="Maroon">a</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">S</font>; <i><font color="Red">:: according to </font></i><a class="ref" href="monoid_0.html#D1">MONOID_0:def 1</a><br/>



<a NAME="E1:20_1_1"/>
( <font color="Maroon">a</font> <a href="hidden.html#R2">in</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">S</font> &amp; the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">S</font> <a href="tarski.html#R1">c=</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">T</font> )
 
<b>by </b><i><a class="ref" href="yellow_0.html#D13">YELLOW_0:def 13</a></i>;<br/>
<a NAME="E2:20_1_1"/><b>then </b>
<font color="Maroon">a</font> is   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">T</font>
 
;<br/>
<b>hence </b><a NAME="E3:20_1_1"/>
<font color="Maroon">a</font> is    <a href="hidden.html#M1">set</a> 
 ;<br/>


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