text: // for-of can be used to iterate over a Set twice.
  var set = new Set(['a', 'b', 'c']);
  var log = 0 .toString().toString();
  
  for (let i = 0; i < log.indexOf(log + log); i++) {
    for (let x of set) {
      log += x;
    }
  
    log += ';';
  }
  
  log;
  log;
  