title: How to iterate through the alphabet?
body: <p>How can I iterate through the alphabet and have it continue past the letter Z? For example - a,b,c ... y,x,aa,ab,ac,ad</p>
  
  <p>At the momenent this is my array </p>
  
  <pre><code>letters = [
             "a","b","c","d","e","f","g","h","i","k",
             "l","m","n","o","p","q","r","s","t","u",
             "v","w","x","y","z", "aa", "ab", "ac", "ad", "ae",
             "af", "ag", "ah", "ai", "aj", "ak", "al", "am", "an",
             "ao", "ap", "aq", "ar", "as", "at", "au", "av","aw", "ax", "ay",
             "az", "ba", "bb", "bc", "bd", "be", "bf", "bg", "bh", "bi",
             "bj", "bk", "bl", "bm", "bn", "bo", "bp", "bq", "br", "bs", "bt",
             "bu", "bv","bw", "bx", "by", "bz","ca","cb","cc","cd","ce",
             "cf","cg","ch","ci","cj","ck","cl","cm","cn","co","cp",
             "cq","cr","cs","ct","cu","cv","cw"]
  </code></pre>
  
  <p>but I want to make it created within a loop.</p>