Can't find the serial number to register my Sony Vaio!?

I have just bought a new laptop, a Sony Vaio VGN-N31M/W.

I am trying to register it, and it is asking me for the serial number at the back of my laptop.

There are several sets of numbers, and I am not sure which one I am supposed to type in. Does anyone know how long the serial code should be or where to locate it?

Thanks :)

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