code: function insertCommas(words) {
  		var len = words.length;
  
  		if (len < 2) {
  			return;
  		}
  
  		var totalCommas = 0;
  		if (len > 3 && len <= 6) {
  			totalCommas = randint(0, 1);
  		} else if (len > 6 && len <= 12) {
  			totalCommas = randint(0, 2);
  		} else {
  			totalCommas = randint(1, 4);
  		}
  
  		for (var i = 0, pos, word; i < totalCommas; i++) {
  			pos = randint(0, words.length - 2);
  			word = words[pos];
  			if (word.charAt(word.length - 1) !== ',') {
  				words[pos] += ',';
  			}
  		}
  	}
docs: Insert commas at randomly selected words. This function modifies values
  inside <code>words</code> array
  @param {Array} words