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<b>let </b><font color="Maroon">L</font> be  <a href="robbins1.html#V7">well-complemented</a> <a href="robbins1.html#NM1">preOrthoLattice</a>;<br/>

<b>assume </b><a NAME="E1:63_2_1"/>
<font color="Maroon">L</font> is <a href="lattices.html#V17">Boolean</a>
 ;<br/>

<b>then reconsider </b><font color="Maroon">L'</font> = <font color="Maroon">L</font> as  <a href="lattices.html#V17">Boolean</a> <a href="robbins1.html#V7">well-complemented</a> <a href="robbins1.html#NM1">preOrthoLattice</a> ;<br/>
<a NAME="E3:63_2_1"/>
<font color="Maroon">L'</font> is <a href="robbins2.html#V1" target="_self">satisfying_DN_1</a>
 
;<br/>
<b>hence </b><a NAME="E4:63_2_1"/>
<font color="Maroon">L</font> is <a href="robbins2.html#V1" target="_self">satisfying_DN_1</a>
 ;<br/>


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