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Lego Chain Reactions Bk LEGO BLOCK Once you get the hangLego Chain Reactions Bk Design and Build Amazon Moving Machines In a chain reaction, one thing leads to another, which leads to another, which leads to another, which. .. well, you get the idea With the stuff in this kit and a pile of your own ordinary LEGO bricks, you can build Ten awesome machines that can be combined to make dozens of different chain reactions that use many steps to do. .. a whole lot of nothing (or maybe something vaguely useful).