assertEquals(five, e.getKey());
assertEquals("E", e.getValue());
assertFalse(i.hasNext());
NavigableMap ssm = sm.tailMap(four, true);
assertEquals(four, ssm.firstKey());
assertEquals(five, ssm.lastKey());
// assertEquals("D", ssm.remove(four));
// assertEquals(1, ssm.size());
// assertEquals(3, sm.size());
// assertEquals(4, map.size());