docs: function valid(connote) {
    if (typeof connote != "string") {
      return false;
    }
  
    connote = connote.trim().toUpperCase();
  
    // handle 14 character couriers please
    if (connote.length === 14 && connote.indexOf("CP") === 0) {
      return false;
    }
  
    return [10, 14, 18, 21, 39, 40].indexOf(connote.length) != -1;
  }