public static Int128 ModAdd(Int128 a, Int128 b, Int128 modulus)
{
Int128 c;
UInt128.ModAdd(out c.v, ref a.v, ref b.v, ref modulus.v);
return(c);
}
public static UInt128 ModularSum(UInt128 a, UInt128 b, UInt128 modulus)
{
return(UInt128.ModAdd(a, b, modulus));
}