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<b>let </b><font color="Maroon">c<sub>4</sub></font> be    <a href="subset_1.html#M2">Element</a> of <font color="Maroon">c<sub>3</sub></font>;<br/>

<a NAME="E1:1_1_1"/>
<font color="Maroon">c<sub>4</sub></font> is    <a href="finseq_2.html#M2">Element</a> of <font color="Maroon">c<sub>2</sub></font>
 
;<br/>
<b>hence </b><a NAME="E2:1_1_1"/>
<font color="Maroon">c<sub>4</sub></font> is    <a href="finseq_1.html#M2">FinSequence</a> of <font color="Maroon">c<sub>1</sub></font>
 ;<br/>


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