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I just live in a longer gap, you know, just in case. Yeah, if you look at quantization actually there's some fabulous maths involved, very interesting maths if you like, you know, all the signal processing and working it out depending on what you want. I always find it strange that they would include it in the exam expecting people to be involved or interested in it. It's too technical for most radiometers to get involved with. Needless to say even need to know it. I've never worked it all out, bothered. And you know it's just a degree level actually. Start looking at the maths. So it's just a point. I mean there's plenty of other things you could pick out that over engineer the whole thing, you know. I mean you know you've only got to look at, I don't know, you've just got to look at the maths and see, you know, where it is. But yeah that's interesting. Have you been to China? I have been to China a few years ago. I was in Beijing. Over.