!7

p {
  L<S> l = new ImmutableSortedList(ll("hello", "world", "abc"));
  assertEquals(3, l(l));
  assertTrue(l.contains("hello"));
  assertTrue(l.contains("world"));
  assertTrue(l.contains("abc"));
  assertFalse(l.contains("whatever"));
  assertEquals(0, l.indexOf("abc"));
  assertEquals(-1, l.indexOf("huh"));
  assertEquals(2, l.indexOf("world"));
  assertEquals("hello", l.get(1));
  print("OK!");
}