public boolean remove(long item1, long item2) {
        checkBiggerEqualZero(item1);
        long h = hash(item1, item2);
        return getSection(h).remove(item1, item2, (int) h);
    }
@Test
    public void testRemove() {
        ConcurrentLongPairSet set = ConcurrentLongPairSet.newBuilder().build();

        assertTrue(set.isEmpty());
        assertTrue(set.add(1, 1));
        assertFalse(set.isEmpty());

        assertFalse(set.remove(1, 0));
        assertFalse(set.isEmpty());
        assertTrue(set.remove(1, 1));
        assertTrue(set.isEmpty());
    }