private static void check(final AtomicIntChunks lc) {
   for (int i = 0; i < lc.length(); i++) {
     assertEquals(i + 1, lc.get(i));
   }
 }
 private static void set(final int start, final AtomicIntChunks lc) {
   for (int i = start; i < lc.length(); i++) {
     lc.set(i, i + 1);
   }
 }