title: How can I decipher a substitution cipher?
body: <p>I have a ciphered text file where <code>A=I</code> <code>a=i</code> <code>!=h</code> etc., I know the right substitutions. How can I generate a readable form of the text?</p>
  
  <p>I have read that it's <a href="https://en.wikipedia.org/wiki/Substitution_cipher" rel="nofollow noreferrer">Substitution Cipher</a></p>