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<b>let </b><font color="Maroon">IPP</font> be  <a href="incproj.html#V9">Fanoian</a> <a href="incproj.html#NM2">IncProjSp</a>;<br/><b>let </b><font color="Maroon">B</font> be   <a href="incsp_1.html#NM2">LINE</a> of <font color="Maroon">IPP</font>;<br/>



<a NAME="E1:19"/>
 ex <font color="Olive">a</font>, <font color="Olive">b</font>, <font color="Olive">c</font>, <font color="Olive">d</font> being  <a href="incsp_1.html#NM1">POINT</a> of <font color="Maroon">IPP</font> ex <font color="Olive">A</font> being  <a href="incsp_1.html#NM2">LINE</a> of <font color="Maroon">IPP</font> st <br/>( <font color="Olive">a</font> <a href="incsp_1.html#R1">on</a> <font color="Olive">A</font> &amp; <font color="Olive">b</font> <a href="incsp_1.html#R1">on</a> <font color="Olive">A</font> &amp; <font color="Olive">c</font> <a href="incsp_1.html#R1">on</a> <font color="Olive">A</font> &amp; <font color="Olive">d</font> <a href="incsp_1.html#R1">on</a> <font color="Olive">A</font> &amp; <font color="Olive">a</font>,<font color="Olive">b</font>,<font color="Olive">c</font>,<font color="Olive">d</font> <a href="incproj.html#R2">are_mutually_different</a>  )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:19"/>
 ex <font color="Olive">p</font>, <font color="Olive">q</font>, <font color="Olive">r</font>, <font color="Olive">s</font> being  <a href="incsp_1.html#NM1">POINT</a> of <font color="Maroon">IPP</font> st <br/>( <font color="Olive">p</font> <a href="incsp_1.html#R1">on</a> <font color="Maroon">B</font> &amp; <font color="Olive">q</font> <a href="incsp_1.html#R1">on</a> <font color="Maroon">B</font> &amp; <font color="Olive">r</font> <a href="incsp_1.html#R1">on</a> <font color="Maroon">B</font> &amp; <font color="Olive">s</font> <a href="incsp_1.html#R1">on</a> <font color="Maroon">B</font> &amp; <font color="Olive">p</font>,<font color="Olive">q</font>,<font color="Olive">r</font>,<font color="Olive">s</font> <a href="incproj.html#R2">are_mutually_different</a>  )
 <b>by </b><i/>;<br/>


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