title: Detecting XOR in Karnaugh Maps
body: <p>I got the following Karnaugh Maps but I am still having problems working out the expression for XOR from each table. </p>
  
  <pre><code>                Table 1
                  -------
                    WZ
           00    01   11   10
         -----------------------
      00 |     |    |    |  1  |
         -----------------------
      01 |  1  |    |    |     |
         -----------------------
  XY  11 |     |    |    |  1  |
         -----------------------
      10 |  1  |    |    |     |
         -----------------------
  
  
                  Table 2 
                  -------
                     WZ
           00     01   11   10
         -----------------------
      00 |     |  1  |     |   |
         -----------------------
      01 |     |     |  1  |   |
         -----------------------
  XY  11 |     |  1  |     |   |
         -----------------------
      10 |     |     |  1  |   |
         -----------------------
  </code></pre>
  
  <p>It is XORs, but how can I easily deduce the XOR expressions?</p>