code: function(len, alphabet) {
                      len = this._v(len, "n");
                      alphabet = this._v(alphabet, "str", "abcdefghijklmnopqrstuvwxyz");
  
                      var lib = alphabet.split("");
                      var arr = this.sample(lib, len, true);
  
                      return arr.join("");
                  }
docs: Generate a random word of specified length using library of characters. Uses English alphabet if no library is specified
  @param len Number of letters in this word
  @param {string} alphabet to use
  @returns {string} String of randomly selected characters from the alphabet