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<b>let </b><font color="Maroon">X</font> be    <a href="struct_0.html#L1">1-sorted</a> ;<br/>

<b>assume </b><a NAME="E1:5_1_1"/><i><font color="Green">E28</font></i>: 
<font color="Maroon">X</font> is <a href="monoid_0.html#V2" target="_self">constituted-FinSeqs</a>
 ;<br/>

<b>let </b><font color="Maroon">a</font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">H<sub>1</sub></font>(<font color="Maroon">X</font>); <i><font color="Red">:: according to </font></i><a class="ref" href="monoid_0.html#D1" target="_self">MONOID_0:def 1</a><br/>

<b>thus </b><a NAME="E2:5_1_1"/>
<font color="Maroon">a</font> is   <a href="funct_1.html#NM1">Function</a>
 <b>by </b><i>, </i>;<br/>


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