@Override
    public V get(Object k) {
        return containsKey(k) ? super.get(k) : defaultValue;
    }
@Test
    public void defaultToOmega() {
        chartis = new DefaultHashMap<>(OMEGA);
        fortioCharti();
        assertEquals("missing 1", ALPHA, chartis.get(ONE));
        assertEquals("missing 2", BETA, chartis.get(TWO));
        assertEquals("three?", OMEGA, chartis.get(THREE));
        assertEquals("four?", OMEGA, chartis.get(FOUR));
    }