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<a NAME="E1:15_1_1"/>
 <a href="gr_cy_1.html#K5">INT.Group</a> <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="group_1.html#G1">HGrStr</a>(# <span class="p1">(<span class="default"><a href="gr_cy_1.html#K1">Segm</a> <font color="Maroon">c<sub>1</sub></font></span>)</span>,<span class="p1">(<span class="default"><a href="gr_cy_1.html#K4">addint</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> #)
 
<b>by </b><i><a class="txt" href="gr_cy_2.html#E1:15"><i><font color="Green">E13</font></i></a>, <a class="ref" href="gr_cy_1.html#D6">GR_CY_1:def 6</a></i>;<br/>
<b>hence </b><a NAME="E2:15_1_1"/>
<font color="Maroon">c<sub>2</sub></font> is   <a href="nat_1.html#NM1">Nat</a>
 <b>by </b><i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a></i>;<br/>


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