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Knee bone connected to the thigh bone Thigh bone connected to the hip bone hip bone connected to the back bone.. and so goes the song. Heres ananoblock set that you can sing the Dem Bones song to. Challenging and fun for construction enthusiasts! nanoblock lets you build in greater detail than ever before as the smallest nanoblock block measures just 4 x 4 mm! This nanoblock set is part of the challenger range. Features: Level of Difficulty - 5 (on a scale of 1-5 with 5 being the most difficult). Number of pieces - 600+. Includes detailed color instructions and spare blocks. Appeals to both boys & girls 12+ years, and adults.