@Override public boolean remove(long key1, int key2) {
        return super.remove0(key1, key2);
    }
@Test
    public void testSize() {
        final long key1 = randomKey();
        final int key2 = randomKey();

        insert(key1, key2);
        assertEquals(1, hsa.size());

        assertTrue(hsa.remove(key1, key2));
        assertEquals(0, hsa.size());
    }