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<a NAME="E1:50_1_1"/>
for <font color="Olive">b<sub>1</sub></font> being   <a href="prob_4.html#M1" target="_self">thin</a> of <font color="Maroon">c<sub>3</sub></font> holds <font color="Olive">b<sub>1</sub></font> is    <a href="prob_1.html#M2">Event</a> of  <a href="prob_4.html#K7" target="_self">COM</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="50_1_1_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">c<sub>4</sub></font> be    <a href="prob_4.html#M1" target="_self">thin</a> of <font color="Maroon">c<sub>3</sub></font>;<br/>

<a NAME="E1:50_1_1_1"/>
<font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R2">in</a>  <a href="prob_4.html#K7" target="_self">COM</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font>
 
<b>by </b><i><a class="ref" href="prob_4.html#T27" target="_self">Th27</a></i>;<br/>
<b>hence </b><a NAME="E2:50_1_1_1"/>
<font color="Maroon">c<sub>4</sub></font> is    <a href="prob_1.html#M2">Event</a> of  <a href="prob_4.html#K7" target="_self">COM</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font>
 <b>by </b><i><a class="ref" href="prob_1.html#D10">PROB_1:def 10</a></i>;<br/>


</div><b>end;</b></div>
<b>hence </b><a NAME="E2:50_1_1"/>
for <font color="Olive">b<sub>1</sub></font> being   <a href="prob_4.html#M1" target="_self">thin</a> of <font color="Maroon">c<sub>3</sub></font> holds <font color="Olive">b<sub>1</sub></font> is    <a href="prob_1.html#M2">Event</a> of  <a href="prob_4.html#K7" target="_self">COM</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font>
 ;<br/>


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