private static UInt128 WeakHashLen32WithSeeds(
UInt64 w, UInt64 x, UInt64 y, UInt64 z, UInt64 a, UInt64 b)
{
a += w;
b = (b + a + z).RotateRight(21);
UInt64 c = a;
a += x;
a += y;
b += a.RotateRight(44);
return new UInt128() { Low = a + z, High = b + c };
}