code: function insertCommas(words) {
  		var len = words.length;
  		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);
  		}
  
  		_.each(_.range(totalCommas), function(ix) {
  			if (ix < words.length - 1) {
  				words[ix] += ',';
  			}
  		});
  	}
docs: Insert commas at randomly selected words. This function modifies values
  inside <code>words</code> array
  @param {Array} words