listBlocks = new BlockSequence();
assertTrue(listBlocks.insert(2, 4));
assertFalse(listBlocks.delete(3, 4));
listBlocks = new BlockSequence();
assertTrue(listBlocks.update(2, 4));
assertFalse(listBlocks.delete(3, 4));
listBlocks = new BlockSequence();
assertTrue(listBlocks.update(2, 4));
assertFalse(listBlocks.insert(3, 4));