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Technically, this is my 3rd Lego set.
The MindCube caught my eyes on YouTube while I was doing some preliminary research on my PhD project. 
It is a Rubik’s Cube solver. It requires one Education Set 8547 just to build the solver. 
I nipped the whole thing from the internet, including the programming in C.

The Lego programming set now has gone through another two changes of generations.
The robotics set seem to have gone off the markets now.
However, most Lego fans would still love to get their hands on a set.

It is still highly recommend but only to do so if you have spare time :)