title: How to reverse a bitwise OR operation?
body: <p>Here's what I've done:</p>
  
  <pre><code>93 | 199
  </code></pre>
  
  <p>which returns</p>
  
  <pre><code>223
  </code></pre>
  
  <p>I understand that this is because <code>0b1011101 | 0b11000111</code> is <code>0b11011111</code></p>
  
  <p>However, suppose I want to do the reverse operation. How do I get <code>0b1011101</code> from a bitwise operation between <code>0b11000111</code> and <code>0b11011111</code>?</p>