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<b>let </b><font color="Maroon">c<sub>2</sub></font> be  non <a href="struct_0.html#V3">empty</a>  <a href="monoid_0.html#M3" target="_self">MonoidalSubStr</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>

<a NAME="E1:94_2_1"/>
<font color="Maroon">c<sub>2</sub></font> is    <a href="monoid_0.html#M2" target="_self">SubStr</a> of <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="ref" href="monoid_0.html#T23" target="_self">Th23</a></i>;<br/>
<b>hence </b><a NAME="E2:94_2_1"/>
<font color="Maroon">c<sub>2</sub></font> is <a href="monoid_0.html#V10" target="_self">idempotent</a>
 <b>by </b><i><a class="ref" href="monoid_0.html#T36" target="_self">Th36</a></i>;<br/>


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