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164 bytes added ,  10:19, 26 May 2016
<pre>not not a;</pre>
 
<pre>&not &not a;</pre>
 
<pre>&not (&not a);</pre>
 
<pre>a and b and c and d;</pre>
 
<pre>true and true;
true and false;
false and true;
false and false;</pre>
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