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<b>reconsider </b><font color="Maroon">c<sub>10</sub></font> = <font color="Maroon">c<sub>9</sub></font> as   <a href="collsp.html#NM2">CollSp</a> <b>by </b><i><a class="txt" href="collsp.html#E36"><i><font color="Green">Lemma21</font></i></a></i>;<br/>
<a NAME="E2:27_1_1"/>
<font color="Maroon">c<sub>10</sub></font> is <a href="collsp.html#V4" target="_self">proper</a>
 
<b>by </b><i><a class="ref" href="collsp.html#D6" target="_self">Def6</a>, <a class="txt" href="collsp.html#E35"><i><font color="Green">Lemma20</font></i></a></i>;<br/>
<b>hence </b><a NAME="E3:27_1_1"/>
ex <font color="Olive">b<sub>1</sub></font> being  <a href="collsp.html#NM2">CollSp</a> st <br/>( <font color="Olive">b<sub>1</sub></font> is <a href="collsp.html#V1" target="_self">strict</a> &amp; <font color="Olive">b<sub>1</sub></font> is <a href="collsp.html#V4" target="_self">proper</a> )
 ;<br/>


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