initMapWithNullValue();

    getMap().forcePut(k1(), null);

    expectContents(mapEntry(k1(), (V) null));

    assertFalse(getMap().containsKey(k0()));

    assertTrue(getMap().containsKey(k1()));
    assertTrue(getMap().inverse().containsKey(null));
    assertNull(getMap().get(k1()));
    assertEquals(k1(), getMap().inverse().get(null));
    assertEquals(1, getMap().size());
  }

	VADDPD.RU_SAE X3, X2, K1, X1     // ERROR "unsupported rounding"
	VADDPD.RD_SAE X3, X2, K1, X1     // ERROR "unsupported rounding"
	VADDPD.RZ_SAE X3, X2, K1, X1     // ERROR "unsupported rounding"
	VADDPD.RN_SAE X3, X2, K1, X1     // ERROR "unsupported rounding"
	VADDPD.RU_SAE Y3, Y2, K1, Y1     // ERROR "unsupported rounding"
	VADDPD.RD_SAE Y3, Y2, K1, Y1     // ERROR "unsupported rounding"
	VADDPD.RZ_SAE Y3, Y2, K1, Y1     // ERROR "unsupported rounding"

      k ^= k >>> 33;
      k *= 0xc4ceb9fe1a85ec53L;
      k ^= k >>> 33;
      return k;
    }

    private static long mixK1(long k1) {
      k1 *= C1;
      k1 = Long.rotateLeft(k1, 31);
      k1 *= C2;
      return k1;
    }

    private static long mixK2(long k2) {
      k2 *= C2;
      k2 = Long.rotateLeft(k2, 33);
      k2 *= C1;
      return k2;
    }
  }

    resetContainer(mapEntry(k0(), v0()), mapEntry(k0(), v1()), mapEntry(k1(), v0()));
    Multiset<K> keys = multimap().keys();
    assertEquals(2, keys.count(k0()));
    assertEquals(1, keys.count(k1()));
    assertEquals(3, keys.size());
    assertContainsAllOf(keys, k0(), k1());
    assertContainsAllOf(
        keys.entrySet(), Multisets.immutableEntry(k0(), 2), Multisets.immutableEntry(k1(), 1));
  }

  @MapFeature.Require(ALLOWS_NULL_KEY_QUERIES)

  }

  public static <K, V> ImmutableBiMap<K, V> of(K k1, V v1) {
    checkEntryNotNull(k1, v1);
    return new SingletonImmutableBiMap<K, V>(k1, v1);
  }

  public static <K, V> ImmutableBiMap<K, V> of(K k1, V v1, K k2, V v2) {
    return new RegularImmutableBiMap<K, V>(ImmutableMap.of(k1, v1, k2, v2));
  }

  public static <K, V> ImmutableBiMap<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3) {

    this.d = d;
    this.k0 = k0;
    this.k1 = k1;
  }

  @Override
  public int bits() {
    return 64;
  }

  @Override
  public Hasher newHasher() {
    return new SipHasher(c, d, k0, k1);
  }

  // TODO(kak): Implement and benchmark the hashFoo() shortcuts.

  @Override
  public String toString() {
    return "Hashing.sipHash" + c + "" + d + "(" + k0 + ", " + k1 + ")";
  }

  @Override

    initMapWithNullValue();

    getMap().forcePut(k1(), null);

    expectContents(mapEntry(k1(), (V) null));

    assertFalse(getMap().containsKey(k0()));

    assertTrue(getMap().containsKey(k1()));
    assertTrue(getMap().inverse().containsKey(null));
    assertNull(getMap().get(k1()));
    assertEquals(k1(), getMap().inverse().get(null));
    assertEquals(1, getMap().size());
  }

    long y = load64(bytes, offset + length - 16) ^ K1;
    long z = load64(bytes, offset + length - 56) ^ K0;
    long[] v = new long[2];
    long[] w = new long[2];
    weakHashLength32WithSeeds(bytes, offset + length - 64, length, y, v);
    weakHashLength32WithSeeds(bytes, offset + length - 32, length * K1, K0, w);
    z += shiftMix(v[1]) * K1;
    x = rotateRight(z + x, 39) * K1;
    y = rotateRight(y, 33) * K1;

    resetContainer(mapEntry(k0(), v0()), mapEntry(k0(), v1()), mapEntry(k1(), v0()));
    Multiset<K> keys = multimap().keys();
    assertEquals(2, keys.count(k0()));
    assertEquals(1, keys.count(k1()));
    assertEquals(3, keys.size());
    assertContainsAllOf(keys, k0(), k1());
    assertContainsAllOf(
        keys.entrySet(), Multisets.immutableEntry(k0(), 2), Multisets.immutableEntry(k1(), 1));
  }

  @MapFeature.Require(ALLOWS_NULL_KEY_QUERIES)

  // From https://131002.net/siphash/siphash24.c
  // k = 00 01 02 ...
  private static final long K0 = 0x0706050403020100L;
  private static final long K1 = 0x0f0e0d0c0b0a0908L;
  private static final HashFunction SIP_WITH_KEY = sipHash24(K0, K1);
  private static final HashFunction SIP_WITHOUT_KEY = sipHash24();

  // These constants were originally ported from https://www.131002.net/siphash/siphash24.c. See: