private static ulong DecompMark(StringView str, ref int i)
{
int endMark = str.IndexOf(')', i);
Vec2 marker = ParseMarker(str.Substring(i + 1, endMark - i - 1).GetString());
i = endMark + marker.X;
return(Decomp2(str.Substring(endMark + 1, marker.X)) * (ulong)marker.Y);
}