title: Finding the essential prime implicants
body: <p>Given the table: <a href="https://i.stack.imgur.com/wiylO.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wiylO.jpg" alt="enter image description here"></a></p>
  
  <p>I tried to find the prime implicants of the function F(w, x, y, z) = sum (0, 2, 5, 7, 8, 10, 12, 13, 14, 15). I got an essential prime implicant of xz. I was wondering if there were more essential prime implicants? I am having trouble understand how to find them.</p>