public class TestStackedConcatsMany {

      public static void main (String... args) {
          for (int i = 0; i < 10; i++) {
              String s = f(" ");
          }
      }

      static String f(String c) {
          String s = " ";
          s = new StringBuilder().append(s).append(s).toString();
          s = new StringBuilder().append(s).append(s).toString();

          s = new StringBuilder().append(s).append(s).toString();
          s = new StringBuilder().append(s).append(s).toString();

          s = new StringBuilder().append(s).append(s).toString();
          s = new StringBuilder().append(s).append(s).toString();

          s = new StringBuilder().append(s).append(s).toString();
          s = new StringBuilder().append(s).append(s).toString();

          s = new StringBuilder().append(s).append(s).toString();
          s = new StringBuilder().append(s).append(s).toString();

          s = new StringBuilder().append(s).append(s).toString();
          s = new StringBuilder().append(s).append(s).toString();

          s = new StringBuilder().append(s).append(s).toString();
          s = new StringBuilder().append(s).append(s).toString();

          s = new StringBuilder().append(s).append(s).toString();
          s = new StringBuilder().append(s).append(s).toString();

          s = new StringBuilder().append(s).append(s).toString();
          s = new StringBuilder().append(s).append(s).toString();

          s = new StringBuilder().append(s).append(s).toString();
          s = new StringBuilder().append(s).append(s).toString();

          s = new StringBuilder().append(s).append(s).toString();
          s = new StringBuilder().append(s).append(s).toString();

          s = new StringBuilder().append(s).append(s).toString();
          s = new StringBuilder().append(s).append(s).toString();

          return s;
      }
  }