title: Trying to simplify Karnaugh Map with only four groups of "True" Indicators
body: <p>In the included screenshot, I am trying to derive the simplest boolean function.  I used these four groups of ones to derive the different variable groups.  According to the solution in my book, I don't have the correct four groups, but it does seem to be a grouping of four and not five.  Does anyone see a grouping scenario I might have missed?  I tried wrapping around but that doesn't seem to help either.</p>
  <p><a href="https://i.stack.imgur.com/lGK7F.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/lGK7F.png" alt="enter image description here" /></a></p>
  <p>My final function of w, x, y, z was the following and it is apparently not the solution:</p>
  <p>F (w, x, y, z) = w'x'z + w'yz' + xy' + wz</p>
  <p><a href="https://i.stack.imgur.com/lGK7F.png" rel="nofollow noreferrer">karnaugh map with my grouping of 1s</a></p>