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<b>reconsider </b><font color="Maroon">c<sub>4</sub></font> = <font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>5</sub></font> = <font color="Maroon">c<sub>3</sub></font> as    <a href="fraenkel.html#M2">Element</a> of  <a href="fraenkel.html#K1">Funcs</a> <font color="Maroon">c<sub>1</sub></font>,<a href="margrel1.html#K6">BOOLEAN</a>  <b>by </b><i><a class="ref" href="bvfunc_1.html#D4">BVFUNC_1:def 4</a></i>;<br/>
<a NAME="E2:4_2_1"/>
<font color="Maroon">c<sub>4</sub></font> <a href="bvfunc26.html#K4" target="_self">'nor'</a> <font color="Maroon">c<sub>5</sub></font> is    <a href="fraenkel.html#M2">Element</a> of  <a href="fraenkel.html#K1">Funcs</a> <font color="Maroon">c<sub>1</sub></font>,<a href="margrel1.html#K6">BOOLEAN</a> 
 
;<br/>
<b>hence </b><a NAME="E3:4_2_1"/>
<font color="Maroon">c<sub>2</sub></font> <a href="bvfunc26.html#K2" target="_self">'nor'</a> <font color="Maroon">c<sub>3</sub></font> is    <a href="subset_1.html#M1">Element</a> of  <a href="bvfunc_1.html#K3">BVF</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="ref" href="bvfunc_1.html#D4">BVFUNC_1:def 4</a></i>;<br/>


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